Add README.md file to repo

Change-Id: Ie72c7a5d7bd7a509d729a8cc529d9e4bfc2b7f63
diff --git a/README.md b/README.md
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index 0000000..9f03b09
--- /dev/null
+++ b/README.md
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+# zuul/config
+This Git repository holds configuration for [Zuul][1].
+
+[1]: https://zuul-ci.org/