add LICENSE file

[Parikshit-Hooda]

Happy to help as part of hacktoberfest!

[pwrmvspark]

@Parikshit-Hooda please review PR# 3. Thank you!

[patricksimonson]

@Parikshit-Hooda @pwrmvspark - What is the status of adding the LICENSE file?

[julianthome]

It would be awesome if you could add a LICENSE file and/or mention the licenses under which the data-sources are published in the README.md.