Add a README

README.md

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+# GraphQL with batteries
+
+- JSON serialization (with Aeson 2 support)
+- Test utilities
+
+This library provides common functionality for the main [graphql package](https://hackage.haskell.org/package/graphql).
+
+## Documentation
+
+API documentation is available through
+[Hackage](https://hackage.haskell.org/package/graphql-spice).