Add Jingzhou supply line scenario

data/campaign/campaign.json

@@ -228,6 +228,11 @@
       "id": "045_fancheng_relief",
       "title": "Fancheng Relief",
       "path": "res://data/scenarios/045_fancheng_relief.json"
+    },
+    {
+      "id": "046_jingzhou_supply_line",
+      "title": "Jingzhou Supply Line",
+      "path": "res://data/scenarios/046_jingzhou_supply_line.json"
     }
   ]
 }