Add Drum Machine

Drum Machine - Drum machine application to create and play drum beats 
`#python` `#gtk4` `#libadwaita`.
Version 1 has been released 10 days ago.

https://github.com/Revisto/drum-machine
https://flathub.org/lt/apps/io.github.revisto.drum-machine

README.md

@@ -204,6 +204,7 @@ this list aims to be broader and include apps from various other ecosystems in v
 - [Audio Sharing](https://apps.gnome.org/AudioSharing) - Application to share audio playback in the form of an RTSP stream `#rust` `#gtk4` `#libadwaita` `#gnome`.
 - [Cavalier](https://github.com/NickvisionApps/Cavalier) - Audio visualizer based on [CAVA](https://github.com/karlstav/cava) `#csharp` `#gtk4` `#libadwaita`.
 - [Chromatic](https://github.com/nate-xyz/chromatic) - Instruments tuner `#rust` `#gtk4` `#libadwaita`.
+- [Drum Machine](https://github.com/Revisto/drum-machine) - Drum machine application to create and play drum beats `#python` `#gtk4` `#libadwaita`.
 - [Ear Tag](https://apps.gnome.org/EarTag) - Tag editor designed to edit singular files `#python` `#gtk4` `#libadwaita` `#gnome`.
 - [EasyEffects](https://github.com/wwmm/easyeffects) - Audio effects manager (limiter, convolver, equalizer, autovolume and more) for PipeWire applications `#c++` `#gtk4` `#libadwaita`.
 - [Lyrebird](https://github.com/lyrebird-voice-changer/lyrebird) - Voice changer based on SoX `#python` `#gtk3`.