Move 'plugin.xml' from 'src-gen' here AND copy following Text to Extensions in 'plugin.xml'

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  <extension
        point="org.eclipse.ui.popupMenus">
     <objectContribution
           id="edu.kit.ipd.descartes.mm.applicationlevel.repository.compositediagram.contribution1"
           nameFilter="*.repository"
           objectClass="org.eclipse.core.resources.IFile">
        <menu
              id="edu.kit.ipd.descartes.mm.applicationlevel.repository.compositediagram.menu1"
              label="DMM"
              path="additions">
           <separator
                 name="group1">
           </separator>
        </menu>
        <action
              class="edu.kit.ipd.descartes.mm.applicationlevel.repository.compositediagram.internal.ExecutableExtensionFactory:edu.kit.ipd.descartes.mm.applicationlevel.repository.compositediagram.popup.actions.InitCreateDiagramWizard"
              enablesFor="1"
              id="edu.kit.ipd.descartes.mm.applicationlevel.repository.compositediagram.newAction"
              label="Create Diagram (Wizard)"
              menubarPath="edu.kit.ipd.descartes.mm.applicationlevel.repository.compositediagram.menu1/group1">
        </action>
     </objectContribution>
  </extension>