Update README.md

Author: paulofaria

README.md

@@ -14,6 +14,18 @@ Looking for help? Find resources [from the community](http://graphql.org/communi
 
 This repo only contains the core GraphQL implementation. For a better experience when creating your GraphQL schema use [Graphiti](https://github.com/GraphQLSwift/Graphiti).
 
+## Contributions
+
+Most of this repo mirrors the structure of the canonical GraphQL implementation written in Javascript/Typescript. If there is any feature missing, looking at the original code and "translating" it to Swift works, most of the time. For example:
+
+### Swift
+
+[/Sources/GraphQL/Language/AST.swift](https://github.com/GraphQLSwift/GraphQL/blob/master/Sources/GraphQL/Language/AST.swift)
+
+### Javascript
+
+[/src/language/ast.js](https://github.com/graphql/graphql-js/blob/master/src/language/ast.js)
+
 
 ## License