login api

login.py

@api_view(['POST'])
def login(request):
    """
    PATH:
        `localhost:8000/api/login/`

    Description:
            Login request handler.

    Request Format: (JSON)

        { username: "frank",
            password: "frank" }

    Response Status:

        200: Success
        401: `password` doesn't match the `username`
        404: `username` not found

    Response Format: (JSON)

        { id: 1,
            username: "frank",
            password: "frank",
            role    : "patient", ..} (including all the personal_info)