Add Greybus for Zephyr post and entry into README.

README.md

@@ -10,7 +10,11 @@ permalink: /about/
 
 Status updates for BeagleBoard.org's Google Summer of Code program.
 
-Be sure to check:
+Primary resources:
 
 * [Forum](https://forum.beaglebord.org/c/gsoc)
 * [Live chat](https://bbb.io/gsocchat)
+
+2022 contributor blog sites:
+
+* [Greybus for Zephyr](https://gsoc.beagleboard.io/greybus-for-zephyr)

_posts/2022-07-01-greybus-for-zephyr.md

+---
+layout: post
+title: 'Hello Greybus for Zephyr'
+---
+
+The Greybus for Zephyr project has launched a blog using git.beagleboard.org pages:
+
+[Greybus for Zephyr](https://gsoc.beagleboard.io/greybus-for-zephyr)