Include list of actions in README

Author: ahpook

README.md

@@ -34,7 +34,11 @@ We have used those as placeholder values where our policies point to internal on
   - [Maximize your open source presence on GitHub](./docs/org-presence-on-github.md)
   - [Measuring maintainer responsiveness and issue metrics](./docs/issue-metrics.md)
   - [Gaining insights into your contributors](./docs/contributor-insights.md)
-- [Internal OSPO newsletters](./newsletter%20template)
+- Actions
+  - [github/stale-repos](https://github.com/github/stale-repos) - Identify and report on repositories with no activity for configurable amount of time, in order to surface inactive repos to be considered for archival
+  - [github/contributors](https://github.com/github/contributors) - Given an organization or repository, produces information about the contributors over the specified time period.
+- [Misc]
+  - Internal OSPO newsletters](./newsletter%20template)
 
 ### Maintainers