mendel: Add releases repo to allow for reproduction builds

This allows us a modicum of reproducibility in our builds by storing the release
manifest files here for later use by end-users or us.

Change-Id: I5dc7d092daea795c1c320a2d12a1e581cdbe25ee
diff --git a/mendel.xml b/mendel.xml
index 5db7cbf..81f2976 100644
--- a/mendel.xml
+++ b/mendel.xml
@@ -17,6 +17,7 @@
     <project name="build" path="build">
       <linkfile src="Makefile" dest="Makefile" />
     </project>
+    <project name="releases" path="releases" />
     <!-- END Build system -->
 
    <!-- BEGIN Misc Tools repos -->