docs: add README with build and runtime dependencies

README.md

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+# FeedTheMonkey
+
+FeedTheMonkey is a desktop client for [Tiny Tiny RSS](https://tt-rss.org). It doesn't
+work as a standalone feed reader — it connects to a TT-RSS server via the Fever/Greader
+API to fetch articles and sync read state.
+
+This is version 3, rewritten in Rust with GTK4 and libadwaita.
+
+## Dependencies
+
+### Runtime
+
+- GTK 4 (`gtk4`)
+- libadwaita (`libadwaita`)
+- WebKitGTK 6 (`webkitgtk-6.0`)
+- GLib / GIO (`glib-2.0`, `gio-2.0`)
+
+On Arch Linux: `sudo pacman -S gtk4 libadwaita webkitgtk-6.0`
+
+### Build
+
+- Rust toolchain (`rustup` / `cargo`)
+- `blueprint-compiler` — compiles `.blp` UI files to `.ui`
+- `glib-compile-schemas` — compiles GSettings schemas (part of `glib2`)
+- `glib-compile-resources` — compiles GResource bundles (part of `glib2`)
+
+On Arch Linux: `sudo pacman -S blueprint-compiler glib2`
+
+## Building
+
+```sh
+cargo build --release
+```
+
+The binary is at `target/release/feedthemonkey`.
+
+## Installing
+
+```sh
+sudo ./install.sh
+```
+
+This installs the binary, icon, desktop entry, and GSettings schema to `/usr/local`.
+Set `PREFIX` to install elsewhere:
+
+```sh
+sudo PREFIX=/usr ./install.sh
+```
+
+## Keyboard shortcuts
+
+| Key | Action |
+|-----|--------|
+| `j` or `→` | Next article |
+| `k` or `←` | Previous article |
+| `Return` | Open in browser |
+| `r` | Reload |
+| `F11` | Toggle fullscreen |
+| `Ctrl+W` | Quit |
+| `Ctrl++` | Zoom in |
+| `Ctrl+-` | Zoom out |
+| `Ctrl+0` | Reset zoom |
+
+## License
+
+Copyright 2015–2026 Jeena
+
+FeedTheMonkey is free software: you can redistribute it and/or modify it under the terms
+of the GNU General Public License as published by the Free Software Foundation, either
+version 3 of the License, or (at your option) any later version.