build: add prettier

Signed-off-by: peterpeterparker <[email protected]>

Author: peterpeterparker

studio/package-lock.json

@@ -73,6 +73,7 @@
     "@types/uuid": "^8.3.1",
     "@types/wicg-file-system-access": "^2020.9.4",
     "autoprefixer": "^10.3.7",
+    "prettier": "^2.4.1",
     "workbox-build": "5.1.4"
   },
   "repository": {