Adds Prettier config to basic server.

Author: DevanB

basic/server/package.json

@@ -6,5 +6,10 @@
   "dependencies": {
     "graphcool-binding": "1.3.5",
     "graphql-yoga": "1.2.5"
+  },
+  "prettier": {
+    "semi": false,
+    "singleQuote": true,
+    "trailingComma": "all"
   }
 }