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/production-disruption/map.ftl

@@ -0,0 +1,7 @@
+## rules.yaml
+briefing = 
+    The Soviets are constructing a new class of submarine capable of launching sea-to-ground missiles. We don't need to tell you the devastation these could cause.
+    
+    Take a small squad of troops and infiltrate their power grid. Once it's down, reinforcements will follow. Then, head north to destroy the sub pen and prevent further construction of these submarines.
+    
+    If any are built, they must not escape!