moved(index.js) moved some codes into startup folder

startup/db.js

@@ -0,0 +1,22 @@
+const mongoose = require("mongoose");
+
+module.exports = function () {
+  if (process.env.NODE_ENV === "test") {
+    mongoose
+      .connect("mongodb://localhost:27017/remembermetest", {
+        useUnifiedTopology: true,
+        useNewUrlParser: true,
+        useCreateIndex: true,
+      })
+      .then(() => console.log("Connected to MongoDB test..."));
+  } else {
+    mongoose
+      .connect(`mongodb://localhost:27017/rememberme`, {
+        useUnifiedTopology: true,
+        useNewUrlParser: true,
+        useCreateIndex: true,
+      })
+      .then(() => console.log("Connected to MongoDB..."))
+      .catch((err) => console.log("Could not connect to MongoDB", err));
+  }
+};