Add licence

[idzikovsky]

Hey, can you please add some licence to this project and to JahstreetOrg/spark-on-kubernetes-docker. I can't use this project because of policies in our company. Furthermore, its not clear if I can use it at all as it's not clear if its free to use. Seems like according to default GitHub licence it isn't:

You're under no obligation to choose a license. However, without a license, the default copyright laws apply, meaning that you retain all rights to your source code and no one may reproduce, distribute, or create derivative works from your work.

Thank you.

[jahstreet]

Hi, I'll try to get to it somewhere this year, but unfortunately doesn't have enough time to constantly maintain this project. It is definitely free and I should reflect it in the licence.

[jahstreet]

Hi @idzikovsky , getting back to the project. Added the license. Please let me know if I can do anything else for you.