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/allies-03a/map.ftl

@@ -0,0 +1,16 @@
+## rules.yaml
+briefing = 
+    LANDCOM 16 HQS.
+    TOP SECRET.
+    TO: FIELD COMMANDER A9
+    
+    INTELLIGENCE RECON SHOWS HEAVY
+    SOVIET MOVEMENT IN YOUR AREA.
+    NEARBY BRIDGES ARE KEY TO SOVIET
+    ADVANCEMENT. DESTROY ALL BRIDGES
+    ASAP. TANYA WILL ASSIST. KEEP HER
+    ALIVE AT ALL COSTS.
+    
+    CONFIRMATION CODE 1612.
+    
+    TRANSMISSION ENDS.