Merge pull request #8507 from saghul/readme-jaas

fix(docs) add JaaS link to README

README.md

 
 Jitsi Meet allows very efficient collaboration. Users can stream their desktop or only some windows. It also supports shared document editing with Etherpad.
 
+**NOTE:** If you are looking for Jitsi as a Service (JaaS) please start [here](https://jaas.8x8.vc).
+
 ## Installation
 
 On the client side, no installation is necessary. You just point your browser to the URL of your deployment. This section is about installing a Jitsi Meet suite on your server and hosting your own conferencing service.