add screenshot, appicon, readme

README.md

@@ -1,3 +1,19 @@
 #Metronome
 
-A metronome for the Flipper Zero device.
+A metronome for the Flipper Zero device. Goes along perfectly with my [BPM tapper](https://github.com/panki27/bpm-tapper)(https://github.com/panki27/bpm-tapper).
+
+![screenshot](img/screenshot.png)
+
+## Features
+
+- BPM adjustable, fine and coarse (hold pressed)
+- Selectable amount of beats per bar
+- First bar is pronounced
+- Selectable note length
+- LED flashes accordingly
+
+## Compiling
+
+```
+./fbt firmware_metronome
+```

application.fam

@@ -7,6 +7,8 @@ App(
     requires=[
         "gui",
     ],
+    fap_icon="metronome_icon.png",
+    fap_category="Music",
     stack_size=2 * 1024,
     order=20,
 )