Add Contents.m to the distrib

Author: petercorke

PackageToolbox.prj

@@ -221,6 +221,7 @@ coverage.xml</param.exclude.filters>
       <file>${PROJECT_ROOT}</file>
     </fileset.rootdir>
     <fileset.rootfiles>
+      <file>${PROJECT_ROOT}/Contents.m</file>
       <file>${PROJECT_ROOT}/+ETS2</file>
       <file>${PROJECT_ROOT}/+ETS3</file>
       <file>${PROJECT_ROOT}/@CodeGenerator</file>