docs(readme): enrich documentation

- Add project overview, feature list, installation and usage instructions
- Include logo and demo screenshot

Author: kh4f

README.md

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+<div align="center">
+	<img alt="logo" src="assets/logo.png">
+	<br>
+	A lightweight Windows utility that <b>alerts you when your AMD GPU overheats</b><br>Perfect for older cards like the RX 550 where the fan may silently stop 🫠
+	<br><br>
+	<b>
+		<a href="#-features">Features</a>&nbsp; •&nbsp;
+		<a href="#-installation">Installation</a>&nbsp; •&nbsp;
+		<a href="#%EF%B8%8F-usage">Usage</a>
+	</b>
+	<br><br>
+	<img alt="demo" src="assets/demo.png">
+</div>
+
+## 🔥 Features
+
+- Monitors GPU state and triggers alerts on overheating
+- Detects fan failures (zero RPM under load)
+- Configurable temperature thresholds
+- Background service with Windows startup support
+
+## 📥 Installation
+
+Download the [latest release](https://github.com/kh4f/amdalert/releases/latest) and extract it anywhere.
+
+## 🕹️ Usage
+
+- Control the app via CLI (`AMDAlert.exe`).
+- Configuration is stored in `settings.json` (created automatically on first run). You can edit it manually or via CLI commands.
+- Enabling alerts starts a background service (`AMDAlertDaemon.exe`) that checks the GPU state every 10 sec and shows notifications when needed.
+
+</br>
+
+<div align="center">
+  <b>MIT License © 2026 <a href="https://github.com/kh4f">kh4f</a></b>
+</div>