database default connection string

[rafiulgits]

CodeHub-Backend/server.js

Line 14 in 593436f

const DB = process.env.DATABASE_LOCAL;

It's seems that to have a default database connection string can help to run this server without getting any initial error.

my suggestion is to make this mentioned code line like this

const DB = process.env.DATABASE_LOCAL || 'mongodb://localhost:27020/codehub';

So that people can understand where he/she have to change.