[Backend] Implement Classroom creation

[lucianak]

• 53

Implement the classroom creation.

To be clarified: what prompts can we receive from the frontend?

Adapter functions: should be implemented in tasks #76 and #77, if necessary just create the function headers you need

Steps:

• [ ] implement method to generate random number student code (5 digits)
• [ ] create new classroom
  • [ ] function in routes: receive name of classroom and the teacher
  • [ ] function in controller: create classroom using the adapter function, return required result/error to frontend
• [ ] add student to classroom
  • [ ] function in routes: receive student name, classroom
  • [ ] function in controller: generate code for student, store student and code using adapter, store student to classroom using adapter, return student code to frontend

[lucianak]

Is already included in other tasks (#76, #124)