Add EasyCLA instructions (#742)

* Add EasyCLA instructions

Signed-off-by: Brian Warner <[email protected]>

* Fix for linter

Signed-off-by: Brian Warner <[email protected]>

Author: brianwarner

README.md

@@ -428,3 +428,13 @@ Community feedback on this experimental release is much appreciated and can be p
 [graphiql]: https://github.com/graphql/graphiql
 [`multer`]: https://github.com/expressjs/multer
 [`express-session`]: https://github.com/expressjs/session
+
+# Contributing to this repo
+
+This repository is managed by EasyCLA. Project participants must sign the free ([GraphQL Specification Membership agreement](https://preview-spec-membership.graphql.org) before making a contribution. You only need to do this one time, and it can be signed by [individual contributors](http://individual-spec-membership.graphql.org/) or their [employers](http://corporate-spec-membership.graphql.org/).
+
+To initiate the signature process please open a PR against this repo. The EasyCLA bot will block the merge if we still need a membership agreement from you.
+
+You can find [detailed information here](https://github.com/graphql/graphql-wg/tree/main/membership). If you have issues, please email [[email protected]](mailto:[email protected]).
+
+If your company benefits from GraphQL and you would like to provide essential financial support for the systems and people that power our community, please also consider membership in the [GraphQL Foundation](https://foundation.graphql.org/join).