Solve fixes : #15 : Fixed async operation

[mathanraj0601]

1 . Fixed async and await Output : (for error case )

2. Corrected spelling of variable
3. Used PORT variable inside

   app.listen();

4. document formatted for app.js

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[Aryainguz]

@mathanraj0601 great work don’t forget to star the repo

[mathanraj0601]

Sure @Aryainguz