Update README.md

Author: nienow

README.md

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+![feature graphic](https://github.com/randombits-dev/interval-timer/raw/main/metadata/en-US/images/featureGraphic.png)
+
 # Interval Timer
 
 An interval timer designed for HIIT workouts. Set your active and rest time, and hit go. Simple and easy-to-use.
+
+<div style="display: flex">
+<img src="https://github.com/randombits-dev/interval-timer/raw/main/metadata/en-US/images/phoneScreenshots/1.png" width="200px"/>
+<img src="https://github.com/randombits-dev/interval-timer/raw/main/metadata/en-US/images/phoneScreenshots/2.png" width="200px"/>
+<img src="https://github.com/randombits-dev/interval-timer/raw/main/metadata/en-US/images/phoneScreenshots/3.png" width="200px"/>
+<img src="https://github.com/randombits-dev/interval-timer/raw/main/metadata/en-US/images/phoneScreenshots/4.png" width="200px"/>
+</div>