Add new pages to the examples covering the Auth procedures

- Add OAuth2 Authorization Code Flow example (py-oauth2-authorization-code/)
  - Complete flow with local callback server for OAuth redirect
  - Token refresh demonstration
  - Production-ready patterns with error handling

- Add OAuth2 Client Credentials Flow example (py-oauth2-client-credentials/)
  - Robot/service account authentication
  - Reusable OAuth2ClientCredentials class with automatic token management
  - Multiple authentication method examples (Basic Auth, body params)

- Add OAuth1 example (py-oauth1/)
  - Legacy authentication support
  - Complete 3-legged OAuth1 flow
  - Migration guidance to OAuth2

- Add AUTH_README.md with:
  - Decision guide for choosing authentication method
  - Quick comparison table
  - Security best practices
  - Troubleshooting guide

- Update main readme.md with authentication section and example index

Each example includes Python script, README with usage instructions,
and requirements.txt for dependencies.

https://planview.projectplace.com/#direct/card/26044157

Author: Kajetan-Narkiewicz-Planview

examples/AUTH_README.md

@@ -0,0 +1,252 @@
+# Authentication Mechanisms for Planview ProjectPlace API
+
+This directory contains examples for all supported authentication methods for the Planview ProjectPlace API.
+
+## Available Authentication Methods
+
+### 1. OAuth2 Authorization Code Flow ⭐ Recommended for User Access
+**Directory**: `py-oauth2-authorization-code/`
+
+Use this when you need to access resources **on behalf of a user**.
+
+**Best for:**
+- Web applications
+- Mobile apps
+- Desktop applications
+- Any integration where users authorize your app to access their data
+
+**Key Features:**
+- User authorizes your application
+- Access tokens valid for 30 days
+- Refresh tokens valid for 120 days
+- Can maintain indefinite access with refresh tokens
+
+[View Example →](./py-oauth2-authorization-code)
+
+---
+
+### 2. OAuth2 Client Credentials Flow ⭐ Recommended for Service Accounts
+**Directory**: `py-oauth2-client-credentials/`
+
+Use this for **robot/service account** authentication without user interaction.
+
+**Best for:**
+- Server-to-server integrations
+- Automated scripts and workflows
+- Bulk data operations
+- Account-wide integrations
+- Background jobs and scheduled tasks
+
+**Key Features:**
+- No user interaction required
+- Account-wide access
+- Simple authentication flow
+- Access tokens valid for 30 days
+
+[View Example →](./py-oauth2-client-credentials)
+
+---
+
+### 3. OAuth1 (Legacy)
+**Directory**: `py-oauth1/`
+
+**⚠️ Legacy Method** - Only use for maintaining existing integrations.
+
+For new projects, use OAuth2 instead.
+
+[View Example →](./py-oauth1)
+
+---
+
+## Quick Comparison
+
+| Method | Use Case | User Interaction | Token Lifetime | Refresh Token |
+|--------|----------|------------------|----------------|---------------|
+| **OAuth2 Authorization Code** | User access | Required | 30 days | Yes (120 days) |
+| **OAuth2 Client Credentials** | Service accounts | Not required | 30 days | No (just request new) |
+| **OAuth1** | Legacy | Required | Permanent | No |
+
+---
+
+## Choosing the Right Authentication Method
+
+### Use OAuth2 Authorization Code Flow when:
+✅ Your app needs to act on behalf of users  
+✅ You need user-specific permissions  
+✅ Building a web/mobile/desktop app  
+✅ Users should control access to their data  
+
+### Use OAuth2 Client Credentials Flow when:
+✅ Building server-to-server integration  
+✅ Need account-wide access (not user-specific)  
+✅ Automating bulk operations  
+✅ Running scheduled jobs  
+✅ No user interaction is possible/desired  
+
+### Use OAuth1 only when:
+⚠️ Maintaining existing OAuth1 integration  
+⚠️ Required by legacy systems  
+
+---
+
+## Getting Started
+
+### For User Authentication (OAuth2 Authorization Code)
+
+1. **Register your application** in ProjectPlace
+   - Go to Settings → Developer → Applications
+   - Create new application
+   - Note Client ID and Client Secret
+   - Set Redirect URI
+
+2. **Try the example**
+   ```bash
+   cd py-oauth2-authorization-code
+   pip install -r requirements.txt
+   # Edit oauth2_authorization_code.py with your credentials
+   python oauth2_authorization_code.py
+   ```
+
+3. **Read the documentation**
+   - [OAuth2 Authorization Code README](./py-oauth2-authorization-code/readme.md)
+   - [API Documentation](https://api.projectplace.com/apidocs#articles/pageOAuth2.html)
+
+### For Service Account Authentication (OAuth2 Client Credentials)
+
+1. **Get robot credentials** from your administrator
+   - Admin goes to Account Administration → Integration settings
+   - Create robot user
+   - Generate OAuth2 credentials
+   - Receive Client ID and Client Secret
+
+2. **Try the example**
+   ```bash
+   cd py-oauth2-client-credentials
+   pip install -r requirements.txt
+   # Edit oauth2_client_credentials.py with your credentials
+   python oauth2_client_credentials.py
+   ```
+
+3. **Read the documentation**
+   - [OAuth2 Client Credentials README](./py-oauth2-client-credentials/readme.md)
+   - [Setup Guide](https://success.planview.com/Planview_ProjectPlace/Integrations/Integrate_with_Planview_Hub%2F%2FViz_(Beta))
+
+---
+
+## API Endpoints
+
+All authentication methods work with the same API endpoints:
+
+**Base URL**: `https://api.projectplace.com`
+
+**Common Endpoints:**
+- `/1/user/me` - Get current user info
+- `/1/user/me/projects` - Get workspaces
+- `/1/projects/{id}/boards` - Get boards
+- `/1/boards/{id}/columns` - Get board columns
+- `/1/columns/{id}/cards` - Get cards
+- `/2/account/projects` - Get all account workspaces (requires appropriate permissions)
+
+**Authorization Header:**
+```
+Authorization: Bearer {access_token}
+```
+
+---
+
+## Security Best Practices
+
+### Never Commit Credentials
+❌ Don't commit `CLIENT_ID`, `CLIENT_SECRET`, or tokens to version control
+
+✅ Use environment variables:
+```python
+import os
+CLIENT_ID = os.environ.get('PROJECTPLACE_CLIENT_ID')
+CLIENT_SECRET = os.environ.get('PROJECTPLACE_CLIENT_SECRET')
+```
+
+### Always Use HTTPS
+❌ Never use HTTP endpoints  
+✅ Always use HTTPS: `https://api.projectplace.com`
+
+### Store Tokens Securely
+❌ Don't store tokens in plain text  
+✅ Use encryption, secure vaults (AWS Secrets Manager, Azure Key Vault, etc.)
+
+### Rotate Credentials Regularly
+✅ Generate new credentials periodically  
+✅ Revoke old credentials after rotation  
+
+### Monitor API Usage
+✅ Log all API calls for audit  
+✅ Set up alerts for unusual activity  
+✅ Implement rate limiting in your application  
+
+---
+
+## Additional Examples Using These Auth Methods
+
+Once you understand authentication, check out these examples that use the auth methods:
+
+- **py-download-document** - Download files using OAuth1
+- **py-upload-document** - Upload files
+- **py-enforce-column-name** - Bulk board updates using Client Credentials
+- **py-consume-odata** - Access OData feeds using Client Credentials
+- **py-board-webhooks** - Set up webhooks
+- **py-bulk-update-emails** - Bulk user operations
+
+---
+
+## Troubleshooting
+
+### Common Issues
+
+**"Invalid client" error**
+- Check your CLIENT_ID and CLIENT_SECRET
+- Ensure no extra spaces or characters
+- Verify credentials are for the correct environment
+
+**"Redirect URI mismatch" (OAuth2 Authorization Code)**
+- Redirect URI in code must exactly match app settings
+- Include protocol (http:// or https://)
+- Match port number exactly
+
+**"Insufficient permissions"**
+- For user auth: User must have appropriate access
+- For robot auth: Robot account must be granted access by admin
+- Check workspace/board-level permissions
+
+**Tokens expire immediately**
+- Check your system clock is synchronized
+- Token expiration is based on timestamps
+
+---
+
+## API Documentation & Resources
+
+### Official Documentation
+- [API Documentation](https://api.projectplace.com/apidocs)
+- [OAuth2 Guide](https://api.projectplace.com/apidocs#articles/pageOAuth2.html)
+- [Success Center](https://success.planview.com/Planview_ProjectPlace)
+
+### Code Examples Repository
+- [GitHub: api-code-examples](https://github.com/Projectplace/api-code-examples)
+
+### Support
+- Contact your Planview administrator for robot account setup
+- [Planview Support](https://success.planview.com)
+
+---
+
+## Contributing
+
+Found an issue or have an improvement? Contributions welcome!
+
+---
+
+**Last Updated**: March 2026
+
+**Disclaimer**: Planview provides these examples for instructional purposes. While you are welcome to use this
+code in any way you see fit, Planview does not accept any liability or responsibility for you choosing to do so.
+