chore: add SECURITY.md, dependabot.yml, CONTRIBUTING.md, LICENSE

Author: Coding-Dev-Tools

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: pip
+    directory: "/"
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 10
+
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: weekly

CONTRIBUTING.md

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+# Contributing to Revenue Holdings
+
+Thank you for your interest in contributing!
+
+## Development Setup
+
+1. Fork the repository
+2. Clone your fork: `git clone https://github.com/YOUR_USERNAME/revenueholdings.git`
+3. Create a virtual environment: `python -m venv venv`
+4. Install dev dependencies: `pip install -e ".[dev]"`
+
+## Making Changes
+
+1. Create a feature branch: `git checkout -b feature/your-feature`
+2. Make your changes
+3. Run linting: `ruff check .`
+4. Run tests: `python -m pytest tests/ -x`
+5. Commit with a descriptive message
+6. Push and open a Pull Request
+
+## Code Style
+
+- We use [ruff](https://docs.astral.sh/ruff/) for linting
+- Line length: 120 characters
+- Python 3.10+ compatible
+
+## Reporting Issues
+
+Please open a GitHub issue with:
+
+- Clear description of the problem
+- Steps to reproduce
+- Expected vs actual behavior

LICENSE

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+MIT License
+
+Copyright (c) 2026 Coding Dev Tools
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.x     | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+We take security seriously. If you discover a vulnerability, please report it responsibly.
+
+**Do not** open a public GitHub issue for security vulnerabilities. Instead, please email security@codingdevtools.com with:
+
+1. Description of the vulnerability
+2. Steps to reproduce
+3. Potential impact
+4. Any suggested fixes
+
+We will acknowledge your report within 48 hours and aim to provide a fix within 7 days.
+
+## Disclosure Policy
+
+- We practice responsible disclosure
+- We ask that you give us reasonable time to fix the issue before public disclosure
+- We will credit researchers who report vulnerabilities (unless they prefer to remain anonymous)