issue-137-User-Deletion-feature

[Saishiva3000]

Issue number: resolves #137

              ## What is the current behavior ?  ---->  User cannot delete account



              ## What is the new behavior? ------> added a end point to delete user in **UserController** and added integration   
                                                                             tests in  **UserControllerTest**>

Note:

the thing i cannot run the application on my laptop because of time zone error of postgres and i can't possibly run i don't know why , i can't solve that issue

please run tests before merging my pleased request (test is correct)