Adds the HomeScreenActivity class and its layout.

This takes care of all the necessary operations in adding a new activity
and its corresponding layout.
Create README.md

An Android application that presents campus events and information to the University of Waterloo's students. The application will interface with the University of Waterloo Open Data API ( https://api.uwaterloo.ca/ ) to accomplish this. This application is currently in production, but you may contribute to it if you wish. Just message me beforehand. The corresponding iOS application can be found here: https://github.com/Jobair96/UWLife-iOS.
Update README.md
Update README.md
Merge remote-tracking branch 'origin/master'
Adds the event handler to sign in button.

The handler uses an explicit intent to start the HomeScreenActivity once
the sign in button is clicked.