[manifest] Add minimal manifest.

Will soon be imported by other manifests that need to install prebuilt
tools.

Bug: IN-702 #comment
Change-Id: If86962fcabdec219083d5b85db3e242323b22b95
diff --git a/manifest/minimal b/manifest/minimal
new file mode 100644
index 0000000..2595c53
--- /dev/null
+++ b/manifest/minimal
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<manifest>
+  <projects>
+    <project name="infra/prebuilt"
+             path="infra/prebuilt"
+             remote="https://fuchsia.googlesource.com/infra/prebuilt"
+             gerrithost="https://fuchsia-review.googlesource.com"/>
+  </projects>
+  <hooks>
+    <hook name="update-prebuilt"
+          project="fuchsia-infra/prebuilt"
+          action="update.sh"/>
+  </hooks>
+</manifest>