readme: add prerequisites to readme (#309)

README.md

@@ -20,32 +20,86 @@
   <a><img src="https://img.shields.io/github/contributors/th33xitus/kiauh"></a>
 </p>
 
-## **🛠️ Instructions:**
+<hr>
 
-For downloading this script it is necessary to have git installed.\
-If you haven't, please run `sudo apt-get install git -y` to install git first.\
-After git is installed, use the following commands in the given order to download and execute the script:
+<h2 align="center">
+  📄️ Instructions 📄
+</h2>
 
-```shell
-cd ~
+### 📋 Prerequisites
+KIAUH is a script that assists you in installing Klipper on a Linux operating system that has
+already been flashed to your Raspberry Pi's (or other SBC's) SD card. As a result, you must ensure 
+that you have a functional Linux system on hand. `Raspberry Pi OS Lite (32bit)` is a recommended Linux image 
+if you are using a Raspberry Pi. The [official Raspberry Pi Imager](https://www.raspberrypi.com/software/) 
+is the simplest way to flash an image like this to an SD card.
 
-git clone https://github.com/th33xitus/kiauh.git
+* Once you downloaded, installed and launched the Raspberry Pi Imager 
+select `Choose OS -> Raspberry Pi OS (other)`: \
+<p align="center">
+  <img src="https://raw.githubusercontent.com/th33xitus/kiauh/master/resources/screenshots/rpi_imager1.png" alt="KIAUH logo" height="350">
+</p>
 
-./kiauh/kiauh.sh
-```
+* Then select `Raspberry Pi OS Lite (32bit)`:
+<p align="center">
+  <img src="https://raw.githubusercontent.com/th33xitus/kiauh/master/resources/screenshots/rpi_imager2.png" alt="KIAUH logo" height="350">
+</p>
+
+* Back in the Raspberry Pi Imager's main menu, select the corresponding SD card to which 
+you want to flash the image.
+
+* Make sure to go into the Advaced Option (the cog icon in the lower left corner of the main menu)
+and enable SSH and configure Wi-Fi.
+
+* If you need more help for using the Raspberry Pi Imager, please visit the [official documentation](https://www.raspberrypi.com/documentation/computers/getting-started.html).
+
+These steps **only** apply if you are actually using a Raspberry Pi. In case you want 
+to use a different SBC (like an Orange Pi or any other Pi derivates), please look up on how to get an appropriate Linux image flashed 
+to the SD card before proceeding further (usually done with Balena Etcher in those cases). Also make sure that KIAUH will be able to run 
+and operate on the Linux Distribution you are going to flash. You likely will have the most success with
+distributions based on Debian 11 Bullseye. Read the notes further down below in this document.
+
+### 💾 Download and use KIAUH
 **📢 Disclaimer: Usage of this script happens at your own risk!**
 
+* **Step 1:** \
+To download this script, it is necessary to have git installed. If you don't have git already installed, or if you are unsure, run the following command:
+```shell
+sudo apt-get install git -y
+```
 
-## **❗ Notes:**
+* **Step 2:** \
+Once git is installed, use the following command to download KIAUH into your home-directoy:
 
-**📋 Please see the [Changelog](docs/changelog.md) for possible important changes!**
+```shell
+cd ~ && git clone https://github.com/th33xitus/kiauh.git
+```
 
-- Tested **only** on Raspberry Pi OS Lite (Debian 10 Buster)
-    - Other Debian based distributions can work
-    - Reported to work on Armbian too
-- During the use of this script you might be asked for your sudo password. There are several functions involved which need sudo privileges.
+* **Step 3:** \
+Finally start KIAUH by running the next command:
 
-## **🌐 Sources & Further Information**
+```shell
+./kiauh/kiauh.sh
+```
+
+* **Step 4:** \
+You should now find yourself in the main menu of KIAUH. You will see several actions to choose from depending 
+on what you want to do. To choose an action, simply type the corresponding number into the "Perform action" 
+prompt and confirm by hitting ENTER.
+
+<hr>
+
+<h2 align="center">❗ Notes ❗</h2>
+
+### **📋 Please see the [Changelog](docs/changelog.md) for possible important changes!**
+
+- Mainly tested on Raspberry Pi OS Lite (Debian 10 Buster / Debian 11 Bullseye)
+    - Other Debian based distributions (like Ubuntu 20 to 22) likely work too
+    - Reported to work on Armbian as well but not tested in detail
+- During the use of this script you will be asked for your sudo password. There are several functions involved which need sudo privileges.
+
+<hr>
+
+<h2 align="center">🌐 Sources & Further Information</h2>
 
 <table>
 <tr>
@@ -117,8 +171,10 @@ git clone https://github.com/th33xitus/kiauh.git
 
 </table>
 
-## **Credits**
+<hr>
+
+<h2 align="center">✨ Credits ✨</h2>
 
 * A big thank you to [lixxbox](https://github.com/lixxbox) for that awesome KIAUH-Logo!
-* Also a big thank you to everyone who supported my work with a [Ko-fi](https://ko-fi.com/th33xitus) !
+* Also, a big thank you to everyone who supported my work with a [Ko-fi](https://ko-fi.com/th33xitus) !
 * Last but not least: Thank you to all contributors and members of the Klipper Community who like and share this project!