Add related repositories to README.md

README.md

@@ -7,9 +7,17 @@ Solidity helpers for working with Seaport on and offchain.
 
 This repo is under active development and should be used with caution in any production environment.
 
-For more information on Seaport, see the [main Seaport repo][seaport-link].
+For more information on Seaport, see the [main Seaport repo][seaport].
 
-[seaport-link]: https://github.com/ProjectOpenSea/seaport
+Related repositories:
+
+- [seaport-core][seaport-core]
+- [seaport-types][seaport-types]
+
+[seaport]: https://github.com/ProjectOpenSea/seaport
+[seaport-core]: https://github.com/ProjectOpenSea/seaport-core
+[seaport-types]: https://github.com/ProjectOpenSea/seaport-types
+[seaport-sol]: https://github.com/ProjectOpenSea/seaport-sol
 [version-badge]: https://img.shields.io/github/package-json/v/ProjectOpenSea/seaport-sol
 [version-link]: https://github.com/ProjectOpenSea/seaport-sol/releases
 [npm-badge]: https://img.shields.io/npm/v/seaport-sol?color=red