Register powscript as a language on Github

[ShalokShalom]

In order to enable coloring in the readme and the "which languages are used in this project bar" in Github, as well to be considered an own language, Github offers this:

https://github.com/github/linguist/blob/master/CONTRIBUTING.md#adding-a-language

As you see, they are asking for a couple of repositories actually using that language, so you could leave that open as a milestone.

[coderofsalvation]

thanks! good to know!