reformat with prettier,add react frontend submodule

package.json

@@ -6,8 +6,8 @@
   "main": "app.js",
   "scripts": {
     "start": "node ./app.js",
-    "debug": "npx nodemon --inspect ./app.js",
-    "test": "jest"
+    "debug": "cross-env NODE_ENV=dev npx nodemon --inspect ./app.js",
+    "test": "cross-env NODE_ENV=test jest"
   },
   "author": "",
   "dependencies": {
@@ -25,14 +25,18 @@
     "passport-local-mongoose": "^5.0.0"
   },
   "devDependencies": {
+    "cross-env": "^5.1.6",
     "eslint": "^4.19.1",
     "eslint-config-airbnb-base": "^12.1.0",
     "eslint-config-node": "^2.0.0",
+    "eslint-config-prettier": "^2.9.0",
     "eslint-plugin-import": "^2.12.0",
     "eslint-plugin-jest": "^21.15.2",
+    "eslint-plugin-prettier": "^2.6.0",
     "jest": "^22.4.4",
     "mongodb-memory-server": "^1.7.4",
     "nodemon": "^1.17.5",
+    "prettier-eslint": "^8.8.1",
     "supertest": "^3.1.0"
   },
   "jest": {