Login.

[earvingemenez]

Assignee: Micheal

Mockup link: zpl.io/a3xZLPd

Acceptance Criteria:

• user should be able to login using their credentials (email, password)
• show error message if the credentials are invalid
• redirect to dashboard page after login
• unit test at users/tests/views_test.py

[earvingemenez]

implement this in angular