Improve Readme

README.md

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 This is a WordPress plugin improves the Fediverse integration of Events via the [WordPress ActivityPub plugin](https://wordpress.org/plugins/activitypub/).
 
-Events plugin that will be supported at first:
+> **_NOTE:_** This is still pre-alpha. It is not more than a skeleton/playground. Things change rapidly. Please contact us, instead of trying it out yourself at this time.
 
-- The Events Calendar
-- VS Event List
-- Events Manager
+For more information checkout our website https://event-federation.eu/.
 
-Planned:
-- All in One Events Calendar
-- 
+## Goals
+* Proper ActivityPub (JSON-LD) representation of events within WordPress
+* Improving the setup and configuration workflow of ActivityPub
+* Researching/Implementing federated RSVP/attendee management
+
+## Supported Event Plugins
+
+### Events plugin that will be supported at first:
+
+* [The Events Calendar](https://de.wordpress.org/plugins/the-events-calendar/)
+* [VS Event List](https://de.wordpress.org/plugins/very-simple-event-list/)
+* [Events Manager](https://de.wordpress.org/plugins/the-events-calendar/)
+* [GatherPress](https://github.com/GatherPress/gatherpress)
+
+### Later:
+- [All in One Events Calendar](https://de.wordpress.org/plugins/all-in-one-event-calendar/)