planning/virtual-spring-2020: Participants section, add name and time slot I can be there

Author: tantek

planning/virtual-spring-2020.txt

@@ -8,8 +8,12 @@ April 29
    11pm -  3am Tokyo
     1am -  5am Melbourne
 
+Venue tech: TBD
+
+Participants:
+  * Tantek Çelik (Mozilla): 08:00-11:00 PDT (SF)
+  * ...
 
-venue tech: TBD
 
 Agenda