Make index.js and Test DB connection

+const config =require('./config')
+const mongoose = require("mongoose");
+const connect = mongoose
+  .connect(config.url, {
+    useNewUrlParser: true,
+    useUnifiedTopology: true,
+  })
+  .then(() => console.log("MongoDB Connected ..."))
+  .catch((err) => console.log(err));
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