Improve Armbian firmware README

README.md

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-# firmware
-Armbian specific firmware
+<h2 align="center">
+  <img src="https://raw.githubusercontent.com/armbian/.github/master/profile/logo.png" alt="Armbian logo" width="25%">
+  <br><br>
+</h2>
+
+### Purpose of This Repository
+
+The **Armbian firmware** repository provides a curated set of binary firmware files required by various hardware components on ARM-based single board computers (SBCs) supported by Armbian.
+
+### Purpose
+
+- Distribute essential **proprietary firmware blobs**.
+- Enable **Wi-Fi**, **Bluetooth**, **GPU**, **VPU**, and other peripherals.
+- Ensure **hardware compatibility** out-of-the-box.
+- Provide a **leaner alternative** to full upstream `linux-firmware` packages by including only relevant firmware for supported boards.
+
+### Usage in Armbian
+
+- Packaged as `armbian-firmware` and installed automatically during OS setup or upgrades.
+- Used by Armbian's custom kernels and U-Boot bootloaders to support board-specific features.
+
+### Includes Firmware for
+
+- Realtek and Broadcom Wi-Fi/Bluetooth chips
+- Mali and other ARM GPU/VPU components
+- Various embedded controllers, USB devices, and more
+
+### Structure
+
+The layout generally follows upstream `linux-firmware` standards, with additional Armbian-specific filtering and optimizations.
+
+> ⚠️ Note: Some firmware files are proprietary and distributed under their respective licenses. Redistribution is limited to non-commercial or usage-only contexts.