0.0.1

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+# rcalc
+
+Desktop calculator for Linux/Windows/macOS, inspired by the Windows Calculator (standard mode).
+
+Built with Rust + [Slint](https://slint.dev).
+
+## Run
+
+```bash
+cargo run --release
+# or
+./dist/rcalc
+```
+
+### Icon (Linux / Wayland)
+
+On **Wayland** the window `icon` property is ignored — the desktop uses
+`.desktop` + `app_id`. Install once:
+
+```bash
+./scripts/install-desktop.sh
+```
+
+Then start **rcalc** from the app menu (or `~/.local/bin/rcalc`), not by
+clicking a random binary path, so KDE/GNOME can match `app_id=rcalc` to
+`rcalc.desktop` and show the icon.
+
+## Features
+
+- Modes: **Standard**, **Programmer**, **Convert**
+- Standard: `+ − × ÷`, `%`, `±`, `1/x`, `x²`, `√x`, memory
+- Programmer: simultaneous **HEX / DEC / OCT / BIN**, sizes **QWORD / DWORD / DINT / WORD / INT / BYTE**,
+  bitwise ops, clickable bits
+  (WORD/DWORD — unsigned DEC; INT/DINT — signed)
+- Convert: **float32 ↔ two 16-bit words** with endian **AB CD / CD AB / BA DC / DC BA**
+- Convert → **Ratio**: float → minimal **num/den** for electronic gear (Byte≤255 / Word≤65535)
+- Convert → **ASCII**: Char ↔ Hex ↔ Dec (control names for NUL…DEL)
+- **CRC**: Modbus RTU CRC-16 + Modbus ASCII LRC from hex bytes (`01 03 00 00 00 0A`)
+- Keyboard input
+
+## Project layout
+
+- `src/engine.rs` — standard calculator logic
+- `src/programmer.rs` — programmer mode logic
+- `src/convert.rs` — float32 / word endian convert
+- `src/main.rs` — UI wiring
+- `ui/app.slint` — Slint interface
+- `dist/rcalc` — release binary