add CONTRIBUTING.md and LISENCE

[ajay-prabhakar]

As the repo is getting popular and it is good to have contribution guidelines and license

Anyone is welcome to contribute to this issue 😄

[ajay-prabhakar]

License is completed, someone can work on adding Contribution guidelines

[emem365]

I'd like to work on this :)

[ajay-prabhakar]

Please go ahead 🚀

[emem365]

Created a PR #7
Check it out. Suggest any changes :)