create README.md

Author: ZackeryRSmith

README.md

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+# Pygments GDScript Lexer
+This lexer was made to fill in the holes [pygments/lexers/gdscript.py](https://github.com/pygments/pygments/blob/master/pygments/lexers/gdscript.py) left.
+A pull request is in the works, but for us, the long wait for the dependency chain is not worth it.
+As such, this is the home of the "better lexer" for use in the [GMLWiki](https://github.com/GodotModding/gmlwiki) until further notice.
+
+To test the highlighting independantly; because let's be real rebuilding the GMLWiki to test it would be overkill.
+You may run [test.py](https://github.com/GodotModding/pygments-gdscript/test.py), which will export a `test.html`.
+Note that you **must** install `pygments` through pip to run the test.