Added a manifest

manifest

diff --git a/manifest b/manifest
new file mode 100644
index 0000000..088f172
--- /dev/null
+++ b/manifest
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<manifest>
+  <projects>
+    <project name="mojo_testing"
+             remote="https://github.com/mojo-experimental/mojo_testing"
+             path="testing"/>
+    <project name="gtest"
+             remote="https://chromium.googlesource.com/external/googletest.git"
+             revision="be1868139ffe0ccd0e8e3b37292b84c821d9c8ad"
+             path="testing/gtest"/>
+    <project name="gmock"
+             remote="https://chromium.googlesource.com/external/googlemock.git"
+             revision="29763965ab52f24565299976b936d1265cb6a271"
+             path="testing/gmock"/>
+  </projects>
+</manifest>