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/survival01/map.ftl

@@ -0,0 +1,12 @@
+## rules.yaml
+briefing = 
+    LANDCOM 66 HQS.
+    TOP SECRET.
+    TO: FIELD COMMANDER A34
+    
+    SOVIETS HAVE LAUNCHED HEAVY ATTACKS ON OUR POSITION.
+     SURVIVE AND HOLD THE BASE UNTIL OUR FRENCH ALLIES ARRIVE.
+    
+    CONFIRMATION CODE 5593.
+    
+    TRANSMISSION ENDS.