Endpoints. Test with Postman.

1. POST: https://contactrest-api.herokuapp.com/api/user/signup
2. POST: https://contactrest-api.herokuapp.com/api/user/signin
3. POST: https://contactrest-api.herokuapp.com/api/contact
4. GET: https://contactrest-api.herokuapp.com/api/:contactid
5. GET: https://contactrest-api.herokuapp.com/api/contact/:contactid
6. PATCH: https://contactrest-api.herokuapp.com/api/contact/:contactid
7. DELETE: https://contactrest-api.herokuapp.com/api/contact/:contactid
8. PATCH: https://contactrest-api.herokuapp.com/api/contact/:contactid/star