Add Incremental Delivery and CCN subcommittees (#1355)

Author: benjie

README.md

@@ -57,12 +57,25 @@ The GraphQL WG has subcomittees who focus on the development of specific
 projects beyond the GraphQL Spec. These subcomittees make progress within their
 own meetings and report back progress and decisions to GraphQL WG meetings.
 
+<!-- prettier-ignore -->
 | Subcommittee     | Time                          | Host                                               | Agenda Repo                                                                                       |
 | ---------------- | ----------------------------- | -------------------------------------------------- | ------------------------------------------------------------------------------------------------- |
 | GraphiQL         | 2nd Tue, 9:00am - 11:00am PT  | [Tim Suchanek](https://github.com/timsuchanek)     | [graphql/graphiql/working-group](https://github.com/graphql/graphiql/tree/main/working-group)     |
-| Composite Schema | 2nd Thu, 8:00am - 10:00am PT  | [Benjie Gillam](https://github.com/benjie)         | [graphql/composite-schemas-wg](https://github.com/graphql/composite-schemas-wg)                   |
-| GraphQL HTTP     | 3rd Thu, 8:00am - 10:00am PT  | [Benjie Gillam](https://github.com/benjie)         | [graphql/graphql-over-http/working-group](https://github.com/graphql/graphql-over-http/tree/main/working-group) |
 | GraphQL.js       | 4th Wed, 10:00am - 11:00am PT | [Ivan Goncharov](https://github.com/IvanGoncharov) | [graphql/graphql-js-wg](https://github.com/graphql/graphql-js-wg)                                 |
+| Incremental Delivery | Most Mondays, 7:00am - 8:00am PT | [Rob Richard](https://github.com/robrichard)    | [robrichard/defer-stream-wg](https://github.com/robrichard/defer-stream-wg)
+| Client Controlled Nullability | 4th Wed, 12:00pm - 1:00pm PT | [Stephen Spalding](https://github.com/fotoetienne) | [graphql/client-controlled-nullability-wg](https://github.com/graphql/client-controlled-nullability-wg) |
+
+#### Subcommittees on hiatus
+
+These subcommittees are currently not meeting, typically due to lack of agenda
+topics. Should you have a topic to discuss that applies to a subcommittee that
+is on hiatus, please raise an issue in the WG repository and mention the host.
+
+<!-- prettier-ignore -->
+| Subcommittee     | Time                          | Host                                               | Agenda Repo                                                                                       |
+| ---------------- | ----------------------------- | -------------------------------------------------- | ------------------------------------------------------------------------------------------------- |
+| Composite Schema | 2nd Thu, 8:00am - 10:00am PT  | [Benjie Gillam](https://github.com/benjie)         | [graphql/composite-schemas-wg](https://github.com/graphql/composite-schemas-wg)                   |
+| GraphQL-over-HTTP | 3rd Thu, 8:00am - 10:00am PT  | [Benjie Gillam](https://github.com/benjie)         | [graphql/graphql-over-http/working-group](https://github.com/graphql/graphql-over-http/tree/main/working-group) |
 
 ### Joining a meeting?