Add Mark to January WG meeting

Happy new year! 🥳

It's possible we still want more time for the RFC to marinate, but I'll attend so I can be available to folks to discuss the schema coordinates rfc/spec edit in person.

graphql/graphql-spec#794

Thanks!

Author: magicmark

agendas/2021-01-07.md

@@ -28,6 +28,7 @@ agenda, edit this file.*
 | Name                     | Organization / Project   | Location
 | ------------------------ | ------------------------ | ------------------------
 | Lee Byron                | GraphQL Foundation       | San Francisco, CA, US
+| Mark Larah               | Yelp                     | San Francisco, CA, US
 | *ADD YOUR NAME ABOVE TO ATTEND*
 
 
@@ -58,4 +59,5 @@ Example agenda item:
 1. Review agenda (2m, Lee)
 1. Review previous meeting's action items (5m, Lee)
    - [All action items](https://github.com/graphql/graphql-wg/issues?q=is%3Aissue+label%3A%22Action+item+%3Aclapper%3A%22)
+1. Discuss [Schema Coordinates Spec](https://github.com/graphql/graphql-spec/pull/794) (10m, Mark)
 1. *ADD YOUR AGENDA ABOVE*