Update README.md

Author: smyrick

README.md

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 # custom-check-examples
 Repository with a sample applications for implementing a GraphOS Schema Check webhook integration
 
+**The code in this repository is experimental and has been provided for reference purposes only. Community feedback is welcome but this project may not be supported in the same way that repositories in the official [Apollo GraphQL GitHub organization](https://github.com/apollographql) are. If you need help you can file an issue on this repository, [contact Apollo](https://www.apollographql.com/contact-sales) to talk to an expert, or create a ticket directly in Apollo Studio.**
+
 TK Link to Custom Check Documentation
 
 ## Netlify Function