User SignIn: SignIn application

[k279avi]

As a user, I want to sign-in into the application.

Features:

1. Sign-in form will have user input fields for email and password.
2. Sign-in form should also have social login feature including sign-in using gmail and facebook account.

Considerations:

1. When users submit blank or incomplete form, error should be shown.
2. When users submit incorrect email or password, error should be shown.

[notamanbag]

Completed this.