add note on how to access shuffle

Signed-off-by: Pascal Sthamer <10992664+P4sca1@users.noreply.github.com>

charts/shuffle/templates/NOTES.txt

@@ -20,6 +20,8 @@ Access the pod you want to debug by executing
 
 {{- end }}
 
-TODO
+To access shuffle using port-forwarding:
+
+1. Run `kubectl port-forward -n shuffle svc/shuffle-frontend 8080:http`
+2. Visit http://localhost:8080 with your browser
 
-{{- include "common.warnings.rollingTag" .Values.backend.image }}