add wiring harness

schematics.kicad_pro

@@ -651,6 +651,10 @@
     [
       "a6e63545-5d73-4d31-a696-14ac8500be8e",
       "Root"
+    ],
+    [
+      "90b95797-6ea0-4394-864b-68d103adb9b2",
+      "wiring_harness"
     ]
   ],
   "text_variables": {}