Please add the missing recommended community standards

[ivuorinen]

GitHub has a comprehensive list of things every open source repository should have.
I would add them myself, but there's the licensing model decision I don't think I can make.

[nullthoughts]

Thanks! License has been added, feel free to contribute to the remaining items :)

[nullthoughts]

Thanks @ivuorinen for all the work. I'll try to tackle the Pull Request Template asap