Hi I have done following modules:

Added Handler Class('Handler.cs')
Added functionality in handler to handle unavailable file type('Handler.cs')
Added Handler list of file types along with its handler name in app.config('app.config')
Added Dispatcher class('Dispatcher.cs')
Added Processor Class for unhandled request ('unHandledFileType.cs')

Recent changes done:
Added test cases for handlers('HandlerFixture.cs')