Add link to wiki to README

README.md

@@ -2,6 +2,11 @@
 
 This is the triage and team assistance bot for the rust-lang organization.
 
+Please see the [wiki] for our documentation, and feel free to contribute edits
+if you find something helpful!
+
+[wiki]: https://github.com/rust-lang/triagebot/wiki
+
 ## Installation
 
 The `GITHUB_WEBHOOK_SECRET` and `GITHUB_API_TOKEN` environment variables need to be set.