docs: add a mention to new properties

Author: Damego

README.md

@@ -45,6 +45,11 @@ client.start()
 
 Example with using `Extension` [here](https://github.com/Damego/interactions-lavalink/tree/main/examples)
 
+## New methods/properties for interactions.py library
+`Member.voice` - returns current member's `VoiceState`. It can be `None` if not cached.
+`Channel.voice_states` - returns a list of voice states of the voice channel. Can be empty if not cached.
+`Guild.voice_states` - returns a list of guild voice states. Can be empty if not cached.
+
 ## Documentation
 
 [lavalink.py documentation](https://lavalink.readthedocs.io/en/master/)