finished DirectX Initialization

Added Cleanup Method to the device and finished the DirectX
Initialization
Cleared the screen
Merge pull request #1 from MarciaVB/Marcia_test_branch

Added name to README
Changed Device name and added Shadermanager
Merge pull request #1 from YannickSegers/master

Update test
Merge remote-tracking branch 'origin/master' into Marcia_test_branch