docs: update readme and add a new screenshot of the app

README.md

@@ -1,17 +1,87 @@
 <div align="center">
-  <h1>CachyOS Welcome</h1>
+  <h1>CachyOS Hello</h1>
   <p>
     <strong>Welcome screen for CachyOS written in Rust</strong>
   </p>
   <p>
 
-![CachyOS-Welcome v.0.16.4](https://github.com/user-attachments/assets/b555d6a5-9550-4869-9a41-734a09d806bf)
-
-
+![CachyOS-Hello](assets/screenshot.png)
 
 [![Dependency Status](https://deps.rs/repo/github/cachyos/cachyos-welcome/status.svg)](https://deps.rs/repo/github/cachyos/cachyos-welcome)
 <br />
 [![CI](https://github.com/cachyos/cachyos-welcome/actions/workflows/rust.yml/badge.svg)](https://github.com/cachyos/cachyos-welcome/actions/workflows/rust.yml)
 
   </p>
 </div>
+
+## Overview
+
+CachyOS Hello is a GTK3 application that serves as the main entry point for new CachyOS users. It provides a graphical interface for system setup, maintenance, and configuration — including service tweaks, one-click fixes, encrypted DNS configuration, quick access to CachyOS tools (Package Installer, Kernel Manager), and a guided installer path on live ISO. Supports 32 languages with runtime locale switching. Also ships a full CLI for scripting and automation.
+
+## CLI
+
+```
+cachyos-hello <COMMAND>
+```
+
+### `fix <ACTION>`
+
+| Action | Description |
+|---|---|
+| `update-system` | Update all system packages |
+| `reinstall-packages` | Reinstall all native packages |
+| `reset-keyrings` | Reset and repopulate pacman keyrings |
+| `remove-lock` | Remove pacman database lock file |
+| `clear-cache` | Clear package cache |
+| `remove-orphans` | Remove orphan packages |
+| `rank-mirrors` | Rank mirrors by speed |
+| `install-gaming` | Install gaming meta-packages |
+| `install-winboat` | Install Winboat |
+| `show-kwin-debug` | Open KWin Wayland debug console |
+
+### `tweak <ACTION>`
+
+```
+cachyos-hello tweak enable <NAME>
+cachyos-hello tweak disable <NAME>
+cachyos-hello tweak list
+```
+
+Available tweaks: `psd`, `oomd`, `bpftune`, `bluetooth`, `ananicy`, `cachy-update`
+
+### `dns <ACTION>`
+
+```
+# Use a preconfigured provider
+cachyos-hello dns set --connection <NAME> --server <SERVER> [--dot] [--doh]
+
+# Use custom DNS addresses
+cachyos-hello dns set-custom --connection <NAME> [--ipv4 <ADDRS>] [--ipv6 <ADDRS>] [--dot] [--doh-url <URL>]
+
+# Reset to automatic
+cachyos-hello dns reset --connection <NAME>
+
+# List available connections / providers / test latency
+cachyos-hello dns list-connections
+cachyos-hello dns list-servers
+cachyos-hello dns test-latency
+```
+
+---
+
+## Building
+
+**Dependencies:** gtk+-3.0, glib-2.0, gio-2.0, Rust toolchain, Meson
+
+```sh
+meson setup build
+meson compile -C build
+meson install -C build  # optional
+meson test -C build     # optional
+```
+
+---
+
+## License
+
+GPL-3.0 — see [LICENSE](LICENSE) for details.