Highlight DAG examples in README (#695)

After speaking with customers, it looks like it would be more clear to
flag our examples in the dev folder in the README.

Co-authored-by: Julian LaNeve <[email protected]>

Author: iancmoritz

README.rst

@@ -31,7 +31,7 @@ Run your dbt Core projects as `Apache Airflow <https://airflow.apache.org/>`_ DA
 Quickstart
 __________
 
-Check out the Quickstart guide on our `docs <https://astronomer.github.io/astronomer-cosmos/#quickstart>`_.
+Check out the Quickstart guide on our `docs <https://astronomer.github.io/astronomer-cosmos/#quickstart>`_. See more examples at `/dev/dags <https://github.com/astronomer/astronomer-cosmos/tree/main/dev/dags>`_.
 
 
 Example Usage