1. Configure Spring MVC and DB(in db.properties file)
2. Create UserResponseDto
3. Implement UserController
   • implement method GET: /users/inject which will create test data. For example, you can create 3 or 4 users in this method and save them to DB.
   • method UserResponseDto get(Long userId), URL: GET: /users/{userId} . This method should return information about user by user id.
   • method List<UserResponseDto> getAll, URL: GET: /users/. This method should return information about all users from DB.
4. Create a UserMapper in service package, where we're gonna perform all mapping to/from DTOs in order to stick with SRP. Use will use this mapper on the controller layer.

You can check yourself using this checklist