Create README.md (#3337)

antlr · Apr 21, 2023 · 08e8a3d · 08e8a3d
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+This is the grammar and lexer for the CGTL (Concrete Grammar Transformation Language). 
+CGTL is used to transform ASTs as produced by ANTLR, into any target textual language or documentation. 
+
+It provides a quick way to build DSML tools and to do tasks such as program abstraction or program translation.