Add npm run format command

Author: tony

package.json

@@ -16,7 +16,8 @@
     "doc.scaphold": "node bin/graphdoc.js -c example.scaphold.json -f -v",
     "doc.starwars": "node bin/graphdoc.js -c example.starWars.json -f -v",
     "doc.starwars-js": "node bin/graphdoc.js -c example.starWars-js.json -f -v",
-    "test": "jest"
+    "test": "jest",
+    "format": "prettier lib plugins template test --write"
   },
   "repository": {
     "type": "git",