Document support for Amcrest AD110 (#350)

I have an Amcrest AD110 running smoothly with this integration. The only reason this doorbell might seem to not work is because it requires a specific firmware version installed for the doorbell API to function at all (https://www.reddit.com/r/homeassistant/comments/nttciw/comment/ijat032/)

Thanks for the great work!

README.md

@@ -114,7 +114,7 @@ Brand | 2 Megapixels | 4 Megapixels | 5 Megapixels | 8 Megapixels
 Brand | 2 Megapixels | 4 Megapixels | 5 Megapixels | 8 Megapixels
 :------------ | :------------ | :------------ | :------------- | :-------------
 | *Amcrest* |
-| | | Amcrest AD410
+| | Amcrest AD110 | Amcrest AD410
 | *Dahua* |
 | | DHI-VTO2202F-P |
 | | DHI-VTO2211G-P |