chore: introduce new README.md

Repository is now used to build Clear NDR ISO.

Author: regit

README.md

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+# Clear NDR Community
+
+## Overview
+
+This repository contains the ressources and tools needed to build ISO images for the Clear NDR Community, a Linux distribution focused on network detection and response (NDR).
+
+The repository was previously known as SELKS but has been rebranded to Clear NDR Community to better reflect profound architectural changes. See the [Clear NDR Community](https://www.stamus-networks.com/clear-ndr-community/) page on Stamus Networks website for more details.
+
+To get more information about Clear NDR and learn how to use it, please visit [Clear NDR documentation](https://docs.clearndr.io).
+
+## Source Code
+
+This repository is used to build the ISO images for Clear NDR Community. It contains a script and the associated configuration files to build the ISO images.
+
+Clear NDR is using [stamusctl](https://github.com/StamusNetworks/stamusctl) to manage the installation and configuration of the system. The configuration files used by stamusctl are stored in a separate repository:
+[Stamusctl Templates](https://github.com/StamusNetworks/stamusctl-templates/tree/main/data/clearndr).
+
+Please use the [stamusctl](https://github.com/StamusNetworks/stamusctl/issues) repository to open issues related to Clear NDR Community.
+
+## Building the ISO
+
+To build the ISO images, you need to have a working installation of [Debian](https://www.debian.org). The build process has been tested on Debian 11 (Bullseye). You will also need to install the dependencies via the install-deps.sh script:
+
+```sh
+sudo ./install-deps.sh
+```
+
+To build the ISO image, clone this repository and run the build script:
+
+```sh
+sudo ./build-debian-live.sh
+```
+
+To build the headless ISO image, run the build script with the `-g no-desktop` option:
+
+```sh
+sudo ./build-debian-live.sh -g no-desktop
+```
+
+For help and more options, run:
+
+```sh
+./build-debian-live.sh -h
+```