reformat with prettier,add react frontend submodule

config/index.js

@@ -1,5 +1,15 @@
 const env = process.env.NODE_ENV;
 
+const prod = {
+  app: {
+    port: process.env.APP_PORT,
+  },
+  db: {
+    uri: process.env.DB_URI,
+  },
+  secret: process.env.SECRET,
+};
+
 const dev = {
   app: {
     port: process.env.DEV_APP_PORT || 4000,
@@ -15,8 +25,9 @@ const test = {
 };
 
 const config = {
+  prod,
   dev,
   test,
 };
 
-module.exports = config[env] || config.dev;
+module.exports = config[env] || config.prod;