add first batch of speakers

Author: NinaWie

_pages/speakers.md

@@ -7,4 +7,9 @@ nav: true
 nav_order: 4
 ---
 
-
+<div class="container">
+    <div class="row row-cols-1 row-cols-md-3">
+    {% include people.liquid name="Constantin Rothkopf" affiliation="TU Darmstadt" url="https://www.pip.tu-darmstadt.de/members_pip/publications.en.jsp" %}
+    {% include people.liquid name="Martin Hebart" affiliation="University of Gießen, MPI Leipzig" url="http://martin-hebart.de/" %}
+    </div>
+</div>