update readme and screenshots

README.md

@@ -5,6 +5,8 @@ A canvas you can draw on with different colors.
 
 Want to draw something but you have no paper? This app will suit you perfectly. Just pick a color and draw. You can either save the drawing or share it directly through email or social networks.
 
+Contains no ads or unnecessary permissions. It is fully opensource, provides a Dark theme too.
+
 <a href='https://play.google.com/store/apps/details?id=com.simplemobiletools.draw'><img alt='Get it on Google Play' src='https://play.google.com/intl/en_us/badges/images/generic/en_badge_web_generic.png' height=60/></a>
 <a href="https://f-droid.org/app/com.simplemobiletools.draw"><img src="https://f-droid.org/badge/get-it-on.png" alt="Get it on F-Droid" height="60"></a>