108536490: Initial effort to implement log in

Add endpoint for post to /sign-in
Initialise role data

tests/app/main/views/test_sign_in.py

@@ -0,0 +1,17 @@
+
+
+def test_render_sign_in_returns_sign_in_template(notifications_admin):
+    response = notifications_admin.test_client().get('/sign-in')
+    assert response.status_code == 200
+    assert 'Sign in' in response.get_data(as_text=True)
+    assert 'Email address' in response.get_data(as_text=True)
+    assert 'Password' in response.get_data(as_text=True)
+    assert 'Forgotten password?' in response.get_data(as_text=True)
+
+
+def test_process_sign_in_return_2fa_template(notifications_admin):
+    response = notifications_admin.test_client().post('/sign-in',
+                                                      data={'email_address': 'valid@example.gov.uk',
+                                                            'password': 'val1dPassw0rd!'})
+    assert response.status_code == 302
+    assert response.location == 'http://localhost/two-factor'