feat: update README and add documentation for installation, configuration, usage, and plugin development

docs/install.md

@@ -0,0 +1,57 @@
+# Installation
+
+## Prerequisites
+
+- **Rust** stable toolchain — install via [rustup](https://rustup.rs)
+- **git**
+- A **Wayland** or **X11** compositor (Linux)
+
+## Build from Source
+
+```bash
+git clone https://github.com/GKaszewski/k-launcher
+cd k-launcher
+cargo build --release
+```
+
+Binary location: `target/release/k-launcher`
+
+### Optional: install to PATH
+
+```bash
+cp target/release/k-launcher ~/.local/bin/
+```
+
+Ensure `~/.local/bin` is in your `$PATH`.
+
+## Autostart
+
+### Hyprland
+
+Add to `~/.config/hypr/hyprland.conf`:
+
+```
+exec-once = k-launcher
+```
+
+### systemd user service
+
+Create `~/.config/systemd/user/k-launcher.service`:
+
+```ini
+[Unit]
+Description=k-launcher command palette
+
+[Service]
+ExecStart=%h/.local/bin/k-launcher
+Restart=on-failure
+
+[Install]
+WantedBy=graphical-session.target
+```
+
+Then enable it:
+
+```bash
+systemctl --user enable --now k-launcher
+```