Added arrays of strings and icons for the navigation
Added colors for the navigation
Added drawer icons
Added XML files to handle background changes on the navigation
Modified MainActivity layout to add the navigation
Added background for the navigation counters
Added layout for the navigation items
Added a class to represent a navigation item
Renamed MenuItem class and added an adapter for it
Added skeleton classes for the main fragments
Raised the minimum API level to 14
Implemented navigation functionality in MainActivity
Removed unnecessary comments
Fixed wrong menu width