Update README.md

Added a resources section with link to blog tag and github issues by label.

Signed-off-by: David Stenglein <[email protected]>

Author: dstengle

platforms-wg/README.md

@@ -21,3 +21,8 @@ or the meetings described below.
 * Zoom: https://zoom.us/j/7276783015?pwd=R0RJMkRzQ1ZjcmE0WERGcTJTOEVyUT09
     * Passcode: 77777
 * Agendas and notes: <https://docs.google.com/document/d/1_smeS9-j-SuHJi0VXjx4g9xiD2-tgqhnlwf5oSMDQgg>
+
+## Resources
+
+* Blog: https://tag-app-delivery.cncf.io/tags/?WG-Platforms=true
+* Github issues: https://github.com/cncf/tag-app-delivery/issues?q=is%3Aissue+is%3Aopen+label%3Awg-platforms