doc: improve readme (#1)

README.md

@@ -1,2 +1,50 @@
-# asampo-gtk
-Audio Sample Organiser (GTK frontend)
+# Asampo: Audio Sample Organizer
+
+Main features:
+- Work with any number of sample sources (plain folders only at this time).
+- Quickly filter/search many thousands of samples.
+- Audio output runs constantly, no hiccups when previewing samples.
+- Organize samples into named sets.
+- Export sample set to single location, optionally with conversion.
+- Load individual samples or full sets into drum machine.
+- Program sequences in drum machine, save and load named sequences.
+- Use drum machine to preview full sets of samples using a suitable sequence.
+- Or just use the drum machine for fun!
+- Saving and loading of workspaces (sources + sets + sequences).
+- No destructive features, except for exporting a sample set to an existing folder.
+- 🦀 Blazingly fast (maybe).
+
+## Requirements
+Asampo currently only runs on Linux using PulseAudio (runs great on `pipewire-pulse`).
+
+## Installation
+Build with `cargo` and then `cargo run`, or use a [Flatpak or AppImage](https://github.com/mkforsb/asampo-gtk/releases).
+
+## Sources
+Add, remove, and toggle sources:
+
+![Sources pane](doc/sources.png)
+
+## Samples
+Filter, play, and assign samples to sets or a drum machine pad.
+
+![Samples pane](doc/samples.png)
+
+## Sets
+Manage sets, assign drum pad labels, load in drum machine or export to single location:
+
+![Sets pane](doc/sets.png)
+
+## Sequences
+Program sequences using a familiar drum machine interface:
+
+![Sequences pane](doc/sequences.png)
+
+# Roadmap
+- [ ] Decent test coverage.
+- [ ] JACK audio support.
+- [ ] Windows support.
+- [ ] AKAI Sample CD source type.
+- [ ] Zip file / other archives source type?
+- [ ] MIDI support?
+- [ ] User manual.