Add gdscript entry in new parser docs

Author: Davidy22

docs/parser-gdscript.rst

@@ -0,0 +1,17 @@
+.. _gdscript:
+
+======================================================================
+The new GDScript parser
+======================================================================
+
+The GDScript parser is written using the token based Python parser as a base
+due to similarities with the Python language. Some adjustments have been made
+for the differences between GDScript and Python. A short list of major
+differences:
+
+- Files are classes. All symbols are attributes of the class defined by the
+file.
+- There are no functions because all symbols are class attributes, so all
+"functions" are methods.
+- Variables are explicitly declared with the `var` keyword.
+- Enum, signal and const keywords are added.

docs/parsers.rst

@@ -15,6 +15,7 @@ This section deals with individual parser topics.
 	parser-asm.rst
 	parser-cmake.rst
 	parser-cxx.rst
+	parser-gdscript.rst
 	parser-html.rst
 	parser-puppetManifest.rst
 	parser-python.rst