Add CONTRIBUTING.md with GitFlow Documentation

[codevalve]

Create a CONTRIBUTING.md file to document our development workflow and contribution guidelines, with special focus on our GitFlow branching strategy.

Tasks:

• Create CONTRIBUTING.md
• Document GitFlow branching strategy:
  • main branch for production
  • develop branch for integration
  • feature/* branches for new features
  • fix/* branches for bug fixes
  • release/* branches for releases
• Add contribution workflow steps
• Document PR process
• Include code style guidelines
• Add commit message conventions

This will help maintain consistency across contributions and make the development process clear for all contributors.

[codevalve]

This is already completed. The CONTRIBUTING.md file exists and includes:

• Comprehensive GitFlow documentation
• Detailed contribution workflow
• PR guidelines
• Code style guidelines
• Commit message conventions

All requirements from the issue have been met.