Add Jiangling rearguard scenario

data/campaign/campaign.json

@@ -158,6 +158,11 @@
       "id": "031_huarong_retreat",
       "title": "Huarong Retreat",
       "path": "res://data/scenarios/031_huarong_retreat.json"
+    },
+    {
+      "id": "032_jiangling_rearguard",
+      "title": "Jiangling Rearguard",
+      "path": "res://data/scenarios/032_jiangling_rearguard.json"
     }
   ]
 }