Add new CLI tool to the parent README.md

Author: dacharyc

README.md

@@ -11,6 +11,7 @@ corpus.
     database in Atlas.
   - `dodec`, or the Database of Devoured Example Code: a query tool that lets us find code examples and related
     metadata in the database for reporting or to perform manual updates.
+- `audit-cli`: A Go CLI project to help us audit docs content from files on the local filesystem.
 - `examples-copier`: a Go app that runs as a GitHub App and copies files from the
    source code repo (generated code examples) to multiple target repos and branches.
 - `github-check-releases`: a Node.js script that gets the latest release versions