add public instances to readme

README.md

@@ -6,6 +6,14 @@ It will additionally alert an admin room about missing bots.
 
 Information about which URLs already got posted is also saved into the admin room via state events.
 
+## Public Instances
+These bots are publicly hosted. Just invite them to a room and they should start doing their job.  
+Just kick them, when you don't want to receive updates anymore.
+
+[Heroes of the Storm](https://matrix.to/#/@snowstorm_heroesofthestorm:imninja.net)  
+[Inside Blizzard](https://matrix.to/#/@snowstorm_insideblizzard:imninja.net)  
+[Overwatch](https://matrix.to/#/@snowstorm_overwatch:imninja.net)  
+[World of Warcraft](https://matrix.to/#/@snowstorm_worldofwarcraft:imninja.net)  
 
 ## Configuration
 First create all users you want to use. All usernames must be `MXID_PREFIX+<game>` (e.g. `snowstorm_worldofwarcraft`). `MXID_PREFIX` is by default `snowstorm_`