Add live demo

PROTOCOL.md

@@ -1,5 +1,10 @@
 # Session Listing Provider protocol
 
+## Live demo
+
+A demo of the listing provider protocol is available at <https://lp.sessioncommunities.online>.
+Does not include onion request endpoint.
+
 ## Mission statement
 
 A listing provider should inform the user of existing Community Servers, organized in one or more listings and supplemented with information provided by the maintainer.

README.md

@@ -81,7 +81,7 @@ Below follow some alternate solutions to provide Community discoverability that,
 
 ## Listing provider model: The What
 
-One can imagine a [simple REST API](PROTOCOL.md) to retrieve a list of communities from a listing provider; all Session would have to do is include the following UI below the community list:
+One can imagine a [simple REST API](PROTOCOL.md) ([live demo](https://lp.sessioncommunities.online/)) to retrieve a list of communities from a listing provider; all Session would have to do is include the following UI below the community list:
 
 ```txt
 Add more communities from list: