Update README.md

Author: daviddias

public-api/README.md

@@ -22,6 +22,9 @@ This RFC is organized by chapters described on the *Table of contents* section.
 
 ## API
 
-- [CLI](./cli)
-- [HTTP](./http)
 - [Core API (aka using IPFS as a package/module)](./core)
+  - [JavaScript implementation details](https://github.com/ipfs/interface-js-ipfs-core)
+  - [Golang implementation details](https://github.com/ipfs/interface-go-ipfs-core)
+- [CLI (the ipfs daemon API)](./cli)
+- [HTTP API](./http-api)
+- [HTTP Gateway](./http-gateway)