Resolve "Configure MongoDB Connection"

Implemented connectDB, as described in #3 (closed); 1st commit introduced the check if connected to DB and make collections, 2nd commit made it fit the requirements and improved the code by adding error handling.

Closes #6 (closed)

added Required label

requested review from @gajesh24

assigned to @strokh24

added 2 commits

• a7c2c85c - Changed DB connection to be taken from .env file; specified DB name
• cebc490e - Removed creation of collections in mongodb.js

Compare with previous version

Looks everything goooooood!!!

mentioned in commit 7455a7d5

merged