feat: configure MongoDB with mevn generate

[danivijay]

What kind of change does this PR introduce?

A feature

Did you add tests for your changes?
No

If relevant, did you update the documentation?
No

Summary

Contributes to #176 . ie, adding MongoDB configuration in server.

Does this PR introduce a breaking change?

No

Other information
This is not a working draft you'll get a basic idea on my thought process. I'm very new to this type of application, and there are some grey areas. Please contact in person if possible so that I can clear my doubts @jamesgeorge007

[welcome]

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[jamesgeorge007]

This looks good already 👍
Left a couple of suggestions.

[jamesgeorge007]

Also, we no longer require this anymore:-

mevn-cli/src/templates/server/basic/server.js

Line 5 in 568f281

// const mongoose = require("mongoose");

mevn-cli/src/templates/server/basic/server.js

Lines 27 to 36 in 568f281

	/* Uncomment these lines once you have the CRUD template
	mongoose.connect(process.env.DB_URL).catch((err) => {
	console.error("eror: " + err.stack);
	process.exit(1);
	});
	mongoose.connection.on("open", () => {
	console.log("connected to database");
	});
	mongoose.Promise = global.Promise;
	*/

[danivijay]

@jamesgeorge007 all the review comments are addressed and PR is updated. Please re-review.

[danivijay]

@jamesgeorge007 added missed file rewrite too. Please verify

[jamesgeorge007]

💯

[welcome]

Congrats on your very first contribution 👏 Looking forward to having more from your side