added app screenshots

README.md

@@ -2,4 +2,14 @@
 
 Searchable list of bribetakers and warmongers. More info on https://acf.international.
 
+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="app/src/main/play/listings/en-US/graphics/phone-screenshots/1.png">
+  <img src="app/src/main/play/listings/en-US/graphics/phone-screenshots/3.png">
+</picture>
+
+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="app/src/main/play/listings/en-US/graphics/phone-screenshots/2.png">
+  <img src="app/src/main/play/listings/en-US/graphics/phone-screenshots/4.png">
+</picture>
+
 <a href='https://play.google.com/store/apps/details?id=com.sirekanian.warmongr'><img height='100' alt='Get it on Google Play' src='https://play.google.com/intl/en_us/badges/images/generic/en_badge_web_generic.png'/></a>