Add support for AGS Script

[ericoporto]

I use AGS Script on Atom, and it would be super if it had somehow support in Atom Beautify!

https://github.com/edmundito/language-ags-script/blob/master/CONTRIBUTING.md https://github.com/edmundito/tree-sitter-ags-script/blob/master/CONTRIBUTING.md

AGS Script is the Scripting language from Adventure Game Studio.

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I came here after Atom gave me the following message:

Atom Beautify could not determine a supported beautifier to handle this file with grammar "AGS Script" and extension "asc". If you would like to request support for this file and its language, please create an issue for Atom Beautify at https://github.com/Glavin001/atom-beautify/issues