Update and rename README to README.md

README

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-Linux kernel
-============
-
-There are several guides for kernel developers and users. These guides can
-be rendered in a number of formats, like HTML and PDF. Please read
-Documentation/admin-guide/README.rst first.
-
-In order to build the documentation, use ``make htmldocs`` or
-``make pdfdocs``.  The formatted documentation can also be read online at:
-
-    https://www.kernel.org/doc/html/latest/
-
-There are various text files in the Documentation/ subdirectory,
-several of them using the Restructured Text markup notation.
-
-Please read the Documentation/process/changes.rst file, as it contains the
-requirements for building and running the kernel, and information about
-the problems which may result by upgrading your kernel.

README.md

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+<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
+
+This repository contains a **customized version of the Linux kernel**, maintained by the **Armbian team**, with specific adaptations for **Rockchip SoCs** (System-on-Chips) used in a wide range of ARM-based single board computers.
+
+It serves as the base for:
+
+- **Kernel development and maintenance** for Armbian-supported devices.
+- **Hardware enablement**, performance tuning, and stability patches specific to Rockchip-based platforms.
+- **Integration with the Armbian build framework** to produce ready-to-use OS images.
+
+This repository is intended for developers, testers, and contributors working with the Armbian project and the broader Rockchip ARM ecosystem.