Add link for adding agenda items

meetings/readme.md

@@ -13,6 +13,8 @@
 * [Can we find a better web-based UI for simple editing?](https://lab.civicrm.org/documentation/docs-publisher/issues/13)
 * Should we turn off the bot-posting in the docs channel?
 
+***[:pencil2: Add an agenda item](https://lab.civicrm.org/documentation/docs/edit/master/meetings/readme.md)***
+
 ## Conference room
 
 https://global.gotomeeting.com/join/469281021