DOC: Add "Supported Versions" section to security policy document

Co-authored-by: James Butler <james.butler@revvity.com>
Co-authored-by: Steve Pieper <pieper@isomics.com>

SECURITY.md

@@ -13,3 +13,15 @@ You should receive a response within 24 hours.
 ## Preferred Languages
 
 We prefer all communications to be in English.
+
+## Supported Versions
+
+You can access the most up-to-date Slicer packages through the official [Slicer download](https://download.slicer.org/) website.
+
+| Version | Support Status     | Update frequency                          |
+| ------- | ------------------ | ----------------------------------------- |
+| Preview | :white_check_mark: | Continual integration of features & fixes |
+| Stable  | :white_check_mark: | Essential security fixes                  |
+
+
+There is no restriction on use, but Slicer is NOT approved for clinical use and the distributed application is intended for research use. Permissions and compliance with applicable rules are the responsibility of the user. For details on the license see [here](https://slicer.readthedocs.io/en/latest/user_guide/about.html#license).