Add discuss Field Coordinates RFC to the agenda (#452)

👋 hi!

Would love to get some discussion going on graphql/graphql-spec#735 / graphql/graphql-spec#746 so I can figure out what (or rather "if") what the next steps might be

thanks!

Co-authored-by: Lee Byron <lee@leebyron.com>

Author: magicmark

agendas/2020-08-06.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
 | Benjie Gillam ✏          | Graphile                 | Southampton, UK
 | *ADD YOUR NAME ABOVE TO ATTEND*
 
@@ -61,4 +62,6 @@ Example agenda item:
    - [All action items](https://github.com/graphql/graphql-wg/issues?q=is%3Aissue+label%3A%22Action+item+%3Aclapper%3A%22)
 1. Tagged type RFC (30m, Benjie)
    - [Spec RFC](https://github.com/graphql/graphql-spec/pull/733)
+1. Field Coordinates RFC (15m, Mark)
+    - [RFC](https://github.com/graphql/graphql-spec/pull/746) / [Discussion Issue](https://github.com/graphql/graphql-spec/issues/735)
 1. *ADD YOUR AGENDA ABOVE*