Merge branch 'routes-documentation' into v3.1.0

.gitignore

ExpressAPI/.idea/swagger-settings.xml

ExpressAPI/assets/OpenAPI/OpenAPI.yaml

ExpressAPI/nodemon.json

ExpressAPI/package-lock.json

ExpressAPI/package.json

ExpressAPI/src/express/API.ts

ExpressAPI/src/managers/GitlabManager.ts

ExpressAPI/src/middlewares/ClientVersionCheckerMiddleware.ts

ExpressAPI/src/middlewares/ParamsCallbackManager.ts

ExpressAPI/src/middlewares/SecurityMiddleware.ts

ExpressAPI/src/middlewares/SessionMiddleware.ts

ExpressAPI/src/routes/AssignmentRoutes.ts

ExpressAPI/src/routes/BaseRoutes.ts

ExpressAPI/src/routes/GitlabRoutes.ts

ExpressAPI/src/routes/SessionRoutes.ts