Update footer text (#737)

Adding language to clarify this is an OSS project, not officially supported by MS

src/AdminSite/Views/Shared/_Layout.cshtml

@@ -162,7 +162,7 @@
     </div>
     <footer class="cm-footer">
         <div class="container text-center">
-            &copy; 2020 - SaasKit - Demo
+            &copy; 2020 - SaasKit - Demo - OSS not support by Microsoft.
         </div>
     </footer>