feat: PostgreSQL score works, added postgresql example, tested on OKD 4.19, added note about incompatible default namespace settings

examples/postgresql/src/main.rs

@@ -0,0 +1,22 @@
+use harmony::{
+    inventory::Inventory, modules::postgresql::PostgreSQLScore, topology::K8sAnywhereTopology,
+};
+
+#[tokio::main]
+async fn main() {
+    let postgresql = PostgreSQLScore {
+        name: "harmony-postgres-example".to_string(), // Override default name
+        namespace: "harmony-postgres-example".to_string(),
+        ..Default::default() // Use harmony defaults, they are based on CNPG's default values :
+                             // "default" namespace, 1 instance, 1Gi storage
+    };
+
+    harmony_cli::run(
+        Inventory::autoload(),
+        K8sAnywhereTopology::from_env(),
+        vec![Box::new(postgresql)],
+        None,
+    )
+    .await
+    .unwrap();
+}