Add Philippe Joly to list of participants

Author: jolyphil

content_development/Task_3.md

@@ -315,5 +315,6 @@ Time to take your new GitHub skills for a test-run! All content development prim
 * Gabriele Orlandi, Paris School of Advanced Studies in Social Sciences (EHESS), France
 * Hande Sodacı, Turkey
 * Luke W. Johnston, Aarhus University, Denmark
+* Philippe Joly, WZB and HU-Berlin
 
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