Create README.md

Author: beacoder

treesit-grammars/README.md

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+# tree-sitter grammars so files will be placed here.
+
+@see https://github.com/casouri/tree-sitter-module
+@see https://git.savannah.gnu.org/cgit/emacs.git/tree/admin/notes/tree-sitter/starter-guide?h=feature/tree-sitter
+@see https://blog.markhepburn.com/posts/experimenting-with-the-built-in-treesitter-support-in-emacs