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docs/databases.md

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 # Relational Databases on Kubernetes
+- [Stateful and Stateless Applications](#stateful-and-stateless-applications)
+- [Databases on Kubernetes](#databases-on-kubernetes)
+- [Database DevOps](#database-devops)
+- [PostgreSQL Operator](#postgresql-operator)
+    - [Crunchy Data](#crunchy-data)
+    - [Spilo](#spilo)
+- [KubeDB Run production-grade databases easily on Kubernetes](#kubedb-run-production-grade-databases-easily-on-kubernetes)
+- [Other solutions](#other-solutions)
+
+## Stateful and Stateless Applications
+* [xenonstack.com: Stateful and Stateless Applications Best Practices and Advantages](https://www.xenonstack.com/insights/stateful-and-stateless-applications/)
+
+[![Statefull and Stateless Aplications](images/stateful-and-stateless-applications.png)](https://www.xenonstack.com/insights/stateful-and-stateless-applications/)
+
+## Databases on Kubernetes
 * [cloud.google.com: To run or not to run a database on Kubernetes - What to consider](https://cloud.google.com/blog/products/databases/to-run-or-not-to-run-a-database-on-kubernetes-what-to-consider)
 * [reddit.com: What's the best, proper way of running a database cluster on top of Kubernetes?](https://www.reddit.com/r/kubernetes/comments/9d8on5/whats_the_best_proper_way_of_running_a_database/)
 * [caylent.com: The Pros and Cons of Running Production Databases as Containers](https://caylent.com/the-pros-and-cons-of-running-production-databases-as-containers)