Merge pull request #146 from sul-dlss/add-connection-readme

Updates README with Postgres Connection

README.md

@@ -73,6 +73,10 @@ code in the plugin, you'll need to restart the `airflow-webserver` container
 by running `cap {stage} airflow:webserver` or ssh into the server and run `docker-compose restart airflow-webserver`
 to see changes in the running Airflow environment.
 
+The `optimistic_locking_management` DAG requires a Postgres Airflow 
+[connection](https://airflow.apache.org/docs/apache-airflow/stable/concepts/connections.html) with the host, login, and password fields matching the
+database being used by Okapi.
+
 ## Testing
 First install the FOLIO-FSE tools run: `pip install folioclient folio-uuid`
 Install sul-dlss fork of folio_migration_tools: `pip install ${local_directory}/folio_migration_tools`