Create croissant_api.lua

[Boring-Dude]

feat: Implement plug-and-play Lua script for Croissant API integration

• Added full OAuth2 authentication flow with token management.
• Implemented methods to interact with the Croissant API (e.g., fetching user data, managing inventory, trading, and multiplayer lobbies).
• Added error handling for common HTTP errors and authentication failures.
• Integrated built-in encryption for OAuth2 tokens for secure storage.
• Script now handles OAuth2 token storage and automatic API interaction with minimal configuration.
• Ensured script is plug-and-play: Replace credentials, install dependencies, and run.