Add yourself to users.md

[Anupam-dagar]

Follow the steps given in readme.md and add yourself to the users.md file accordingly.

[Himanshi-Khandelwal]

@Anupam-dagar I want to work on this.

[Anupam-dagar]

@Himanshi-Khandelwal you are good to go.

[berviantoleo]

I think the users.md without the numbers will better because, if use numbering, sometimes will raised same number in some pull request.

[arpitbatra123]

Please check #15