[Chart] Add readme to annotations

charts/k8s-linkup/Chart.yaml

@@ -8,6 +8,9 @@ annotations:
       url: https://edugit.org/AlekSIS/libs/k8s-linkup/-/issues
     - name: sourcecode
       url: https://edugit.org/AlekSIS/libs/k8s-linkup
+  artifacthub.io/screenshots: |
+    - title: k8s-linkup running with OpenVPN backend in k9s
+      url: https://edugit.org/AlekSIS/libs/k8s-linkup/-/raw/master/screenshot.webp
   artifacthub.io/changes: |
     - Set default HAProxy log level to notice