Just add it to the end.. before "EndGlobal"
....
GlobalSection(ExtensibilityGlobals) = postSolution
ShellProjectGuid = AD29D932-7ACE-4AB0-85F1-160E6E1AB7EA
CommonProjectGuid = B4216841-2D76-4D7D-B3D2-14A2EF8268FE
RootNamespace = Rdhobby.Administration
EndGlobalSection
EndGlobal