Create README.md first pass at README content

Will be able to write more after the next Roundtable meeting.

Author: cottage14

README.md

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+This repository hosts GitHub Actions developed by the ASF community and approved for any ASF top level project to use.
+
+**Note** - The <a href="https://infra.apache.org/roundtable.html" target="_blank">Infrastructure Roundtable</a> on June 3, 2024 will discuss how this repository will function--how to submit an Action, who approves Actions for inclusion, based on what, and who maintains them and responds when issues come up. Please check here after that date for more information.
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+### GH Actions available
+
+  - [ASF Infrastructure Pelican Action](/pelican/README.txt)