#1975: add example for Cassandra module

docs/modules/databases/cassandra.md

@@ -1,5 +1,38 @@
 # Cassandra Module
 
+## Usage example
+
+This example connects to the Cassandra Cluster, creates a keyspaces and asserts that is has been created.
+
+```java tab="JUnit 4 example"
+public class SomeTest {
+
+    @Rule
+    public CassandraContainer cassandra = new CassandraContainer();
+
+
+    @Test
+    public void test(){
+        Cluster cluster = cassandra.getCluster();
+
+        try(Session session = cluster.connect()) {
+
+            session.execute("CREATE KEYSPACE IF NOT EXISTS test WITH replication = \n" +
+                    "{'class':'SimpleStrategy','replication_factor':'1'};");
+
+            List<KeyspaceMetadata> keyspaces = session.getCluster().getMetadata().getKeyspaces();
+            List<KeyspaceMetadata> filteredKeyspaces = keyspaces
+                    .stream()
+                    .filter(km -> km.getName().equals("test"))
+                    .collect(Collectors.toList());
+
+            assertEquals(1, filteredKeyspaces.size());
+        }
+    }
+
+}
+```
+
 ## Adding this module to your project dependencies
 
 Add the following dependency to your `pom.xml`/`build.gradle` file: