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/cnc/maps/gdi04a/map.ftl

@@ -0,0 +1,9 @@
+## rules.yaml
+briefing = 
+    Nod has captured classified GDI property.
+    
+    You must find and retrieve the stolen equipment.
+    
+    It is being transported in a shipping crate.
+    
+    Use the new APC to safely transport infantry through Nod forces.