app/{gerrit,bazel-cache} -> devtools/

Change-Id: I2a98f33c76a59392e644579a1f7064a7c8eaec7c
diff --git a/devtools/README b/devtools/README
new file mode 100644
index 0000000..3646363
--- /dev/null
+++ b/devtools/README
@@ -0,0 +1,4 @@
+hscloud/devtools
+================
+
+Tools related to the review, build and test infrastructure.