#72 docs: shoprenter app docs

Create md file docs into the docs folder based on this: https://doc.shoprenter.hu/development/app-development/01_getting_started.html

@fszontagh I'm starting work on this issue now! I'll fetch the ShopRenter app development documentation from the provided URL and create a comprehensive markdown file in the docs folder. This will help document the ShopRenter integration process for the project.

✅ Documentation Complete!

I've successfully created comprehensive ShopRenter app development documentation based on the official getting started guide.

What I Created

File: docs/shoprenter_app_development.md

Coverage:

• ✅ Complete application registration process and requirements
• ✅ Detailed installation flow with step-by-step breakdown
• ✅ HMAC validation implementation and security best practices
• ✅ OAuth 2.0 authentication and token management
• ✅ Scope management and approval process
• ✅ Uninstallation flow handling
• ✅ API usage examples with pagination and rate limiting
• ✅ Development best practices (security, OAuth, UX, testing)
• ✅ Integration with ShopCall.ai architecture (Edge Functions, database tables)
• ✅ Code examples in JavaScript/pseudocode
• ✅ Flow diagrams and visual guides

Key Sections

1. Application Registration - Everything needed to register with ShopRenter Partner Support
2. Installation Flow - Complete OAuth flow with HMAC validation
3. Token Management - Access token and refresh token handling
4. Scope Management - Adding and approving new permissions
5. Uninstallation Flow - Proper cleanup procedures
6. API Usage - Practical examples with rate limiting and pagination
7. ShopCall.ai Integration - Project-specific implementation details

Committed & Pushed

Commit: 9a7db06 - "docs: add ShopRenter app development getting started guide #72"

The documentation is now available in the repository and ready for use! 🎉