Added visiting PhD student to the people page

Author: amjjbonvin

_data/members.yml

@@ -87,6 +87,10 @@
 - name: Luca Gazolla
   position: Visiting Ph.D Candidate
   avatar: /images/people/Luca-Gazolla.png
+  
+- name: Cintia Leal
+  position: Visiting Ph.D Candidate
+  avatar: /images/people/Cintia-Leal.png
 
 - name: Jahaciel Villaverde Nogues
   position: M.Sc Student