Add 3 known issues, including an Editor crash fixed in 4.5
Add 3 known issues, including an Editor crash fixed in 4.5

 - issue #9 The UE4.4 Editor crashes when closing the Source Control Module: Bug of Editor 4.4, already fixed by Epic in master for 4.5 but not in 4.4
 - issue #10: Add the "Copy" operation replacing "Delete" + "Add"
 - issue #11: Add the "Resolve" operation introduced in Editor 4.3

SRombauts/UE4GitPlugin,SRombauts/UE4GitPlugin,SRombauts/UE4GitPlugin