add a fat man with a beard to the list of participants

Author: Paul Griffiths

content_development/Task_3.md

@@ -316,5 +316,6 @@ Time to take your new GitHub skills for a test-run! All content development prim
 * Hande Sodacı, Turkey
 * Luke W. Johnston, Aarhus University, Denmark
 * Philippe Joly, WZB and HU-Berlin
+* Paul Griffiths, NCAS and U. Cambridge
 
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