added a small note on how to try out the test plug in runner.
added a small note on how to try out the test plug in runner.

LesleyLai/cppunit,project-zerus/cppunit,ryancalhoun/cppunit,freedesktop-unofficial-mirror/libreoffice__cppunit,freedesktop-unofficial-mirror/libreoffice__cppunit,LesleyLai/cppunit,ryancalhoun/cppunit,ryancalhoun/cppunit,LesleyLai/cppunit,freedesktop-unofficial-mirror/libreoffice__cppunit,LesleyLai/cppunit,ryancalhoun/cppunit,freedesktop-unofficial-mirror/libreoffice__cppunit,project-zerus/cppunit,project-zerus/cppunit