Initial commit: OpenRA game engine

Fork from OpenRA/OpenRA with one-click launch script (start-ra.cmd)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

mods/ra/maps/soviet-09/map.ftl

@@ -0,0 +1,5 @@
+## rules.yaml
+briefing = 
+    The Allied forces have intercepted and destroyed a convoy that carried parts for our secret weapon. One truck remains, but they have captured that last truck and its cargo.
+    
+    This is not acceptable! You are to destroy that truck before the Allies leave the area with it.