Add submodule legitimate USB_Host_Shield_2.0

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "protocol/lufa/LUFA-git"]
 	path = protocol/lufa/LUFA-git
 	url = https://github.com/abcminiuser/lufa.git
+[submodule "protocol/usb_hid/USB_Host_Shield_2.0"]
+	path = protocol/usb_hid/USB_Host_Shield_2.0
+	url = https://github.com/felis/USB_Host_Shield_2.0.git

protocol/usb_hid/USB_Host_Shield_2.0

@@ -0,0 +1 @@
+Subproject commit 2b4a56de3d090686f62d25ea34042759dc4352d6