Added a copy of SGC

sgc/example/menu

@@ -0,0 +1,16 @@
+("m:Main Menu",
+    ("m:Sub-menu",
+        ("w:input_box","name=input","label=Input","default=start typing"),
+        ("c:Category/divider",),
+        ("w:button","name=btn","label=Click\nhere","func=print_input")
+    ),
+    ("m:Settings",
+        ("m:Graphic Settings",
+            ("c:Graphic stuff",)
+        ),
+        ("m:Sound Settings",
+            ("c:Sound stuff",)
+        )
+    ),
+    ("f:remove", "Quit")
+)