Add License

[FaFre]

Please add a license to the project. Thank you!

[FaFre]

I want to publish my app on f-droid where it is required for all dependencies to be under an appropriate open source license. At the moment there has been no proper license added. @aloisdeniel is it possible to license this package properly?

[FaFre]

@mattlewis92 could you please have a look into this? I see you are the only registered member of the organization here now. Would be great to have any kind of OSS license attached to the code to make it safe to use in my project. Thank you a lot!