Add stub on how to launch kde_partition manager.

source/3/3.1/3.1.7/kde_partitionmanager.rst

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+Chapter 3.1.7 KDE partition manager
+===================================
+
+KDE partition manager creates partitions and deletes partitions on your hard drives and solid state drives.
+
+Version
+-------
+Lubuntu ships with version 3.3.1 of partition manager.
+
+How to launch
+-------------
+To launch kde partition manager from the menu -> system tools -> KDE partition manager or run partitionmanager from the command line. 
+