add pull request template discouraging contributions
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
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+These style guides are copies of Google's internal style guides to
+assist developers working on Google owned and originated open source
+projects. Changes should be made to the internal style guide first and
+only then copied here.
+Unsolicited pull requests are not accepted and will be closed without
+If this PR does anything other than update a style guide with changes
+already made to the internal copy, please do not create it.
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