chore: add atlassian jira and confluence

examples/atlassian-jira-confluence/README.md

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+# References
+
+- https://atlassian.github.io/data-center-helm-charts/containers/JIRA/
+- https://atlassian.github.io/data-center-helm-charts/containers/CONFLUENCE/
+- https://hub.docker.com/r/atlassian/jira-core
+- https://hub.docker.com/r/atlassian/confluence
+
+# Notes
+
+The Jira Core container requires a database.
+
+The compose stack will spawn up a postgresql database for this. You can configure the database connection from Jira's setup wirard via the HTTP UI.
+
+May use a dedicated `.env` file to provide your custom DB credentials.