Add Contributing Guidelines and Development Workflow

[seansica]

Description

We should establish formal contributing guidelines and development workflow documentation for the attack-workbench-taxii-server repository, matching the standards set in our attack-data-model repo.

This will include:

1. Basic contribution guidelines (issue templates, PR process)
2. Development workflow setup with:
   • ESLint + Prettier for code quality and formatting
   • Husky for Git hooks:
     • Pre-commit: Run formatting
     • Pre-push: Run tests
     • Commit-msg: Enforce conventional commits
3. Semantic-release configuration:
   • Standard plugins and channels
   • Version management approach
   • Release workflow documentation

Implementation Tasks

• Copy and adapt CONTRIBUTING.md from attack-data-model
• Set up ESLint + Prettier with same config
• Configure Husky with identical Git hooks
• Install and configure semantic-release
• Add issue templates for bugs and feature requests
• Update package.json with required dependencies and scripts
• Update README.md to reference new contributing guidelines

Additional Notes

Reference repo: https://github.com/mitre-attack/attack-data-model

The goal is to maintain consistency across our repos while making it easier for contributors to participate in development.