Add OCaml GraphQL server library

Author: wokalski

site/code/index.html.js

@@ -43,6 +43,7 @@ In addition to the GraphQL [reference implementations in JavaScript](#javascript
 - [Rust](#rust)
 - [Scala](#scala)
 - [Swift](#swift)
+- [OCaml / Reason](#ocaml-reason)
 
 ### C# / .NET
 
@@ -601,6 +602,10 @@ val query = graphql"{ hello }"
 Executor.execute(schema, query) map println
 \`\`\`
 
+### OCaml / Reason
+
+#### [ocaml-graphql-server](https://github.com/andreas/ocaml-graphql-server): GraphQL server library for OCaml and Reason
+
 ## GraphQL Clients
 
 - [C# / .NET](#c-net-1)