doc: Add procedure to check expiry date DOCS-664 (#805)

* doc: Add procedure to check expiry date

* doc: Tweak

Co-authored-by: Nicola Klemenc <nicola.klemenc@codacy.com>

---------

Co-authored-by: Nicola Klemenc <nicola.klemenc@codacy.com>

Author: claudiacarpinteiro

docs/maintenance/license.md

@@ -27,3 +27,13 @@ Some changes to your Codacy plan require that you update your Codacy Self-hosted
                  --values values-production.yaml \
                  # --values values-microk8s.yaml
     ```
+
+## Checking the expiration date of your Codacy license
+
+To check the expiration date of your Codacy license, do the following:
+
+1.  Click the **Admin** link in the top right-hand corner.
+
+1.  On the **Dashboard** page, search for your organization and click the organization identifier to navigate to its details.
+
+1.  On the **Organization details**, check your **Plan expiry date**.