Update the repo website & add LICENSE, CONTRIBUTOR.MD files

[cchantep]

Could use https://github.com/jsuereth/scala-arm/community

[jsuereth]

Yes, I'll try to get a CoC + all that set up tonight!

[joaquin-silva-truata]

Hi
Has this issue been addressed ?
I am wondering which is exactly the License of this Library. Readme file talks about Scala license, but Scala license uses Apache 2.0 / BSD 3-Clause and in your license there is no mention to it.
Thanks