[manifest] Add manifest back.

This is needed for the tools builder.

Bug: 41580
Change-Id: I03c5efd6117e33c801619141a08eeef86775b52c
diff --git a/manifest b/manifest
new file mode 100644
index 0000000..32733a1
--- /dev/null
+++ b/manifest
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<manifest>
+  <projects>
+    <project name="tools"
+             path="go/src/go.fuchsia.dev/tools"
+             remote="https://fuchsia.googlesource.com/tools"
+             gerrithost="https://fuchsia-review.googlesource.com"/>
+  </projects>
+</manifest>