Initial commit of external/ply

Test: none
Change-Id: Ib308017155c9e98ef44b8dd8e2442c44d29ac680
diff --git a/README.google b/README.google
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+URL: https://github.com/dabeaz/ply
+License: BSD
+License File: README.md
+Owners: egranata
+
+Description:
+A tool to generate parsers and lexers in Python (similar to lex/yacc for C)
+
+Local Modifications:
+Added this README.google file