Add screenshot in readme

README.md

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 # HalfDot for Umami
 
-HalfDot is a minimalistic FOSS Android client for Umami: an open-source and privacy-focused web analytics platform.
+HalfDot is a minimalistic **FOSS Android client for [Umami](https://github.com/umami-software/umami)**: an open-source and privacy-focused web analytics platform.
 
-## Characteristics
+HalfDot is:
 
-* Free
-* Open source
-* No tracking
-* No ads
-* Material Design 3
+* Free.
+* Open source.
+* Without tracking.
+* Without ads.
+* Material Design 3.
 
+<img src="halfdot_screenshots.png" height="700">
+
+## Contributing
+
+Any contribution is welcome :)
+
+### Authors
+
+* [Davide Quaranta](https://github.com/davquar)
+* You?
+
+## Disclaimer
+
+* I'm not affiliated with Umami Software.
+* I built this app to learn Flutter and Dart: something may not be idiomatic/best.