mongoose connection

[anakshiant]

Do not use hard coded value keep it in config.json or environment variable suggestion - use dotenv npm package for configuration management

• If unable to connect to database application should not continue it should either retry or exit from process process.exit

https://github.com/sushant8421/portfolio_dev/blob/26a3283ba197d6cd16987a4ba882f4ba65e598ac/index.js#L18

[sushant8421]

yeah i learned that also, but it was just for checking purpose and i will modify it as you suggested.