docs(readme): Deprecating the project because the REST API has a Grap…

…hQL endpoint now

README.md

@@ -1,5 +1,8 @@
 # The Rick and Morty GraphQL API
 
+# ⚠️ WARNING ⚠️
+> This project is no longer maintained because the [Rick and Morty API](https://github.com/afuh/rick-and-morty-api) has a GraphQL endpoint now. Check it out here: https://rickandmortyapi.com/graphql
+
 This is a GraphQL wrapper over the [Rick and Morty API](https://github.com/afuh/rick-and-morty-api) ([Documentation](https://rickandmortyapi.com/documentation)), which is based on the television show [Rick and Morty](https://en.wikipedia.org/wiki/Rick_and_Morty). Using it, you will access to data about hundreds of characters, images, locations and episodes.
 
 **To get started, you can jump right to [GraphiQL](https://rickandmortyapi-gql.now.sh/) to see the docs and write some queries.**