Add GradleUp blog to /participate

Author: oleg-nenashev

docs/community/participate.md

@@ -1,7 +1,25 @@
-# GradleUp Community Channels
+---
+title: Participate in GradleUp
+description: >
+    Subscribe to the GradleUp news,
+    join the discussions on Slack and GitHub issues 
+---
 
 [![Slack: GradleUp on the Gradle Community Slack](https://img.shields.io/badge/Slack-%23gradleup-brightgreen?style=flat&logo=slack)](./#slack)
 
+Subscribe to the GradleUp news, join the discussions on Slack and GitHub issues.
+All code and non-code contributions are welcome!
+
+## News
+
+We have a blog on [blog.gradleup.com](https://blog.gradleup.com/).
+There we will be publishing the key updates on what's up in GradleUp.
+You can also subscribe to the blog as a [newsletter](https://blog.gradleup.com/newsletter)
+or [RSS feed](https://blog.gradleup.com/rss.xml).
+
+Guest posts by GradleUp users and component maintainers are welcome, too!
+Reach out to us on Slack if interested
+
 ## GitHub Issues
 
 Each project repository has GitHub Issues enabled.