Added backend skeleton

.env

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+# Define all IP, username and password here

app.js

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+// Requiring module
+const express = require('express');
+const mongoose = require('mongoose');
+
+// Creating express object
+const app = express();
+
+app.use(express.json()); 
+// Handling GET request
+app.get('/', (req, res) => { 
+    res.send('A simple Node App is '
+        + 'running on this server') 
+    res.end() 
+}) 
+
+// Port Number
+const PORT = process.env.PORT ||5000;
+
+// Server Setup
+app.listen(PORT,console.log(
+  `Server started on port ${PORT}`));

package.json

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+{
+  "dependencies": {
+    "express": "^4.18.2",
+    "nodemon": "^3.0.3"
+  },
+  "start": "node app.js",
+  "dev": "nodemon app.js",
+  "serve": "nodemon server.js",
+  "name": "exerciseapp",
+  "version": "1.0.0",
+  "main": "app.js",
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": ""
+}

routes/exercise.js

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+const express = require("express");
+const app = express();
+const router = express.Router();
+const { createLogger, transports } = require("winston");
+
+const logger = createLogger({transports:[new transports.Console]});
+
+router.get("/exercise",function(req,res){
+
+    try{
+
+    } catch(err){
+        logger.err("Routes","GET exercise", "Error : "+JSON.stringify(err));
+    }
+});
+
+router.post("/exercise",function(req,res){
+    try{
+
+    } catch(err){
+        logger.err("Routers","POST exercise", "Error : "+JSON.stringify(err));
+    }
+})

routes/user.js

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+const express = require("express");
+const app = express();
+const router = express.Router();
+const { createLogger, transports } = require("winston");
+
+const logger = createLogger({transports:[new transports.Console]});
+
+router.get("/user",function(req,res){
+
+    try{
+
+    } catch(err){
+        logger.err("Routes","GET user", "Error : "+JSON.stringify(err));
+    }
+});
+
+router.post("/user",function(req,res){
+    try{
+
+    } catch(err){
+        logger.err("Routers","POST user", "Error : "+JSON.stringify(err));
+    }
+})