Create CONTRIBUTORS.md to acknowledge all project contributors

Description

We need to create a CONTRIBUTORS.md file to properly acknowledge and give credit to all the people who have contributed to the ruv-FANN project.

Motivation

• Recognize the valuable contributions from the community
• Provide transparency about who has helped build this project
• Encourage future contributions by showing appreciation

Implementation Plan

1. Gather Contributors

   • Review all GitHub issues and pull requests
   • Start with @ruvnet as the project creator
   • Include all contributors who have:
     • Submitted merged PRs
     • Reported issues that led to improvements
     • Provided valuable feedback or ideas
     • Contributed to documentation

2. CONTRIBUTORS.md Format

   # Contributors
   
   Thank you to all the contributors who have helped make ruv-FANN better!
   
   ## Project Creator
   - **[ruvnet](https://github.com/ruvnet)** - Project creator and maintainer
   
   ## Code Contributors
   - [Contributor Name](https://github.com/username) - Brief description of contributions
   
   ## Issue Contributors
   - [Contributor Name](https://github.com/username) - Reported issues #X, #Y
   
   ## Documentation Contributors
   - [Contributor Name](https://github.com/username) - Improved documentation
   

3. Process for Future Contributors

   • Update CONTRIBUTORS.md when merging significant PRs
   • Include a note in PR template about contributor recognition
   • Consider automating with GitHub Actions in the future

Tasks

• Create initial CONTRIBUTORS.md file
• Review all issues and PRs to identify contributors
• Add contributors with appropriate categories
• Submit PR with the new file
• Update contributing guidelines to mention contributor recognition

cc @ruvnet - This issue tracks the creation of a contributors file to acknowledge everyone who has helped with the project.