added builder and kieker to feature

tools.descartes.pmx.feature/feature.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <feature
       id="tools.descartes.pmx.feature"
-      label="PMX Feature"
+      label="PMX core feature"
       version="1.0.0.qualifier">
 
    <description>
@@ -28,4 +28,18 @@ For purposes of the EPL, &quot;Program&quot; will mean the Content.
          version="0.0.0"
          unpack="false"/>
 
+   <plugin
+         id="kieker"
+         download-size="0"
+         install-size="0"
+         version="0.0.0"
+         unpack="false"/>
+
+   <plugin
+         id="tools.descartes.pmx.builder"
+         download-size="0"
+         install-size="0"
+         version="0.0.0"
+         unpack="false"/>
+
 </feature>