Add Guanzhong foothold scenario

data/campaign/campaign.json

@@ -183,6 +183,11 @@
       "id": "036_weishui_crossing",
       "title": "Weishui Crossing",
       "path": "res://data/scenarios/036_weishui_crossing.json"
+    },
+    {
+      "id": "037_guanzhong_foothold",
+      "title": "Guanzhong Foothold",
+      "path": "res://data/scenarios/037_guanzhong_foothold.json"
     }
   ]
 }