all: add README.md files where missing, and tool to keep them updated
Change-Id: I385171c415bf168c04c6c3a7a996bff88964af84
Reviewed-on: https://go-review.googlesource.com/52856
Reviewed-by: Andrew Bonventre <andybons@golang.org>
diff --git a/cmd/gitmirror/README.md b/cmd/gitmirror/README.md
new file mode 100644
index 0000000..e6584e2
--- /dev/null
+++ b/cmd/gitmirror/README.md
@@ -0,0 +1,7 @@
+<!-- Auto-generated by x/build/update-readmes.go -->
+
+[](https://godoc.org/golang.org/x/build/cmd/gitmirror)
+
+# golang.org/x/build/cmd/gitmirror
+
+The gitmirror binary watches the specified Gerrit repositories for new commits and reports them to the build dashboard.