(rdcman) Add missing files section

This updates the nuspec file to include the section
that controls what files should be included or not.

automatic/rdcman/rdcman.nuspec

@@ -25,4 +25,7 @@ Upgrade note: RDG files with version 2.8+ of RDCMan are not compatible with olde
 Starting from 2.8, RDCMan is published by Microsoft as a portable zip package, instead of an MSI installer. As a consequence, no Start Menu icon is created when this package is installed.
     </releaseNotes>
   </metadata>
+  <files>
+    <file src="tools\**" target="tools" />
+  </files>
 </package>