Merge branch '44-api-documentation' into 'main'

backend/README.md

backend/assets/apidoc.png

backend/documentation.md

backend/package.json

backend/src/controllers/gameController.ts

backend/src/controllers/highscoreController.ts

backend/src/controllers/userController.ts

backend/src/functions/console.ts

backend/src/functions/firebaseCache.ts

backend/src/functions/getUserById.ts

backend/src/index.ts

backend/src/middleware/expressLogger.ts

backend/src/middleware/firebaseLogger.ts

backend/src/routes/gameRoutes.ts

backend/src/routes/highscoreRoutes.ts

backend/src/routes/lobbyRoutes.ts

backend/src/routes/serverRoutes.ts

backend/src/routes/userRoutes.ts

backend/tsconfig.json

backend/yarn.lock