Added preview image and added info to README

README.md

@@ -3,20 +3,40 @@
 [![GitHub release (latest by date including pre-releases)](https://img.shields.io/github/v/release/kotatogram/kotatogram-desktop?include_prereleases&label=version&style=flat)][releases]
 [![GitHub Workflow Status: Windows](https://img.shields.io/github/workflow/status/kotatogram/kotatogram-desktop/Windows.?label=Windows&logo=windows)][actions]
 [![GitHub Workflow Status: Linux](https://img.shields.io/github/workflow/status/kotatogram/kotatogram-desktop/Linux.?label=Linux&logo=linux)][actions]
-[![Packaging status](https://repology.org/badge/tiny-repos/kotatogram-desktop.svg)][repology]
+
+[![Preview of Kotatogram Desktop][preview_image]][preview_image_url]
 
 Original README with build instructions and licenses could be found in [Telegram Desktop repository][telegram_desktop_readme].
 
-Currently there are builds of Kotatogram for Windows (installer and portable) and Linux 64-bit, autoupdater included.
+## Builds
+* Windows (installer and portable)
+* Linux (64-bit)
+  * [Flathub][flatpak]
+  * Other repositories:<br>[![Packaging status](https://repology.org/badge/vertical-allrepos/kotatogram-desktop.svg)][repology]
 
-Expect a lot of breaking changes.
+## Features
+* Custom font
+* Compact chat list
+* Custom text replaces
+* Change sticker size
+* Adaptive chat bubbles
+* and other smaller features.
 
-Changelog can be found [here][changelog].
+Full list of features will rewritten later, for now you can use one of `control-*` branches. These branches have changes split by feature instead of chronologically.
+
+## Other links
+* Website: https://kotatogram.github.io
+* English Telegram channel: https://t.me/kotatogram
+* Russian Telegram channel: https://t.me/kotatogram_ru
+* Trello (on Russian): https://trello.com/b/G6zetXOH/kotatogram-desktop
 
 [//]: # (LINKS)
 [telegram_desktop]: https://desktop.telegram.org
 [releases]: https://github.com/kotatogram/kotatogram-desktop/releases
 [actions]: https://github.com/kotatogram/kotatogram-desktop/actions
-[repology]: https://repology.org/project/kotatogram-desktop/versions
 [telegram_desktop_readme]: https://github.com/telegramdesktop/tdesktop/blob/dev/README.md
+[repology]: https://repology.org/project/kotatogram-desktop/versions
+[flatpak]: https://flathub.org/apps/details/io.github.kotatogram
 [changelog]: https://github.com/kotatogram/kotatogram-desktop/blob/dev/kotatogram_changes.txt
+[preview_image]: https://github.com/kotatogram/kotatogram-desktop/blob/dev/docs/assets/ktg_preview.png "Preview of Kotatogram Desktop"
+[preview_image_url]: https://github.com/kotatogram/kotatogram-desktop/blob/dev/docs/assets/ktg_preview.png