chore: add missing file

compose-graphql/README.md

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+## GraphQL Compose
+
+Built on top of [ZIO Compose]. GraphQL compose intends to solve the problem of API Composition.
+It comes in two parts —
+
+1. **DSL:** This is used to write the composition spec. Once the spec is written, it's validated and optimized by the compiler.
+2. **Runtime:** A high-performance runtime that executes takes in a graphQL request and resolves it using a composition spec.
+
+## Demo
+
+A demo usage for [jsonplaceholder] is available here —
+
+1. [DSL Usage]
+2. [Unit Tests]
+
+[jsonplaceholder]: https://jsonplaceholder.typicode.com/
+[Unit Tests]: https://github.com/tailcallhq/zio-compose/blob/main/compose-graphql/src/test/scala/compose/graphql/JsonPlaceholderSpec.scala
+[DSL Usage]: https://github.com/tailcallhq/zio-compose/blob/main/compose-graphql/src/test/scala/compose/graphql/internal/JsonPlaceholder.scala
+
+[ZIO Compose]: https://github.com/tailcallhq/zio-compose