docs: Create CONTRIBUTING.md guide

[Mattis44]

Description

Create a comprehensive CONTRIBUTING.md file to help new developers get started contributing to the project.

What to include

1. Getting Started section

   • Clone and setup instructions
   • How to install dependencies
   • How to run tests locally
   • How to run the demo

2. Development Workflow

   • Branch naming convention
   • Commit message format
   • Code style guidelines
   • Testing requirements

3. Pull Request Process

   • How to create a PR
   • PR title/description format
   • Review process
   • Merge requirements

4. Project Structure

   • Brief overview of key directories
   • Where different types of files belong
   • Component structure

5. Resources

   • Links to relevant documentation
   • TypeScript guidelines
   • Testing library resources

Template Reference

You can reference: https://github.com/facebook/react/blob/main/CONTRIBUTING.md

Labels

good first issue, documentation, help wanted