Add Hanzhong approach scenario

data/campaign/campaign.json

@@ -193,6 +193,11 @@
       "id": "038_ma_chao_retreat",
       "title": "Ma Chao Retreat",
       "path": "res://data/scenarios/038_ma_chao_retreat.json"
+    },
+    {
+      "id": "039_hanzhong_approach",
+      "title": "Hanzhong Approach",
+      "path": "res://data/scenarios/039_hanzhong_approach.json"
     }
   ]
 }