dragonfly-operator-system: Update README

dragonfly-operator-system/README.md

@@ -1,5 +1,25 @@
 # Dragonfly Operator
 
+Dragonfly operator is the preferred way to add Redis support to your application.
+
+Following alternatives were considered:
+
+* Vanilla Redis' replication is clunky and there is no reliable operator for Kubernetes
+  to use vanilla redis
+* KeyDB Cluster was unable to guarantee strong consistency
+
+# For users
+
+For examples refer to [../passmower/dragonfly.yaml]
+
+Use storage class `redis` for persistent instances.
+To achieve high availabilllity use 2+ replicas with correctly configured
+`topologySpreadConstraints`.
+
+# For administrators
+
+The operator was deployed with following snippet:
+
 ```
 kubectl apply -f https://raw.githubusercontent.com/dragonflydb/dragonfly-operator/v1.1.6/manifests/dragonfly-operator.yaml
 ```