docs: add linux screenshot

Author: kavishdevar

linux/README.md

@@ -6,7 +6,10 @@ A native Linux application to control your AirPods, with support for:
 - Conversational Awareness
 - Battery monitoring
 - Auto play/pause on ear detection
-- Seamless handoff between phone and PC
+- Hearing Aid features
+   - Supports adjusting hearing aid- amplification, balance, tone, ambient noise reduction, own voice amplification, and conversation boost
+   - Supports setting the values for left and right hearing aids (this is not a hearing test! you need to have an audiogram to set the values)
+- Seamless handoff between Android and Linux
 
 ## Prerequisites