Added the readme for instructions and the .rest file for easy access

feat: add security middleware (helmet, sanitize, rate limit) and message validation

added a new route for the regular getting messages and seperate to historyCached for the previous way

feat: implement async lastMessage update and protected chat endpoints

feat: complete login phase with JWT generation and input validation

feat: complete registration flow with validation and global error handling

feat: setup express server and MongoDB connection with /ping route

feat: initialize project structure and setup TypeScript with dev server and gitignore

Initial commit