chore: point to adding linter instructions

README.md

@@ -32,7 +32,7 @@ We have a separate project for formatting, see <https://github.com/aspect-build/
 [tricorder]: https://static.googleusercontent.com/media/research.google.com/en//pubs/archive/43322.pdf
 [reviewdog]: https://github.com/reviewdog/reviewdog
 
-## Available linters:
+## Available linters
 
 - Protocol Buffers
   - `buf lint`: <https://buf.build/docs/lint/overview>
@@ -43,7 +43,8 @@ We have a separate project for formatting, see <https://github.com/aspect-build/
 
 ### Adding a linter
 
-TODO: step-by-step instructions to add a linter in this repo, and maybe how to add one in your repo.
+Please follow the steps in [lint/README.md](./lint/README.md) and then send us a PR.
+Thanks!!
 
 ## Installation