planning/virtual-spring-2020: [Participants] add self

Author: hober

planning/virtual-spring-2020.txt

@@ -57,6 +57,7 @@ We will use #css on IRC for all meeting coordination. People can use the chat in
 | Peter Linss | Invited Expert | yes | yes | | unlikely |
 | Nat McCully | Adobe | mostly | yes | | |
 | Atsushi Shimono | W3C | mostly | probably | Generic font family | |
+| Theresa O'Connor | Apple | the first hour | all | | |
 
 If you can't make one of the slots, note any topics you want us to bias towards the slot you can make.