Update README.md

README.md

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-# brightnessctl-polybar
-Polybar module and custom script for brightnessctl package.
+# brightnessctl polybar module
+Polybar module using a custom script for adjusting screen brightness using the brightnessctl package.
+
+The brightnessctl package is the only one that managed to change the brightness of my laptop screen. Other packages failed to work. Therefore, I wrote this script and module to be able to adjust screen brightness using brightnessctl from polybar. It is adjusted by scrolling up and down on the module.
+
+## Installation
+1. Download the files as a ZIP or clone into a temporary directory.
+2. Move `brightnessctl.sh` to `~/.config/polybar/` file.
+3. Make `brightnessctl.sh` executable by executing `chmod u+x ~/.config/polybar/brightnessctl.sh`.
+4. Decide where you will put the module. Depending on your choice, add `brightnessctl` to the `modules-left=`,`modules-center=` or `modules-right=` row in your polybar config file.
+5. Add the following lines to the `~/.config/polybar/config` file:
+    
+```
+[module/brightnessctl]
+type = custom/script
+exec = ~/.config/polybar/brightnessctl.sh
+
+scroll-up = exec brightnessctl set +5%
+scroll-down = exec brightnessctl set 5%-
+interval = 0.2
+
+format-prefix = " "
+label = %output%
+label-foreground = #FFFFFF
+```
+
+## Note
+- This module uses a custom icon from the `MaterialIcons` font package. If you do not have this you may install it, or choose your own gliph, simply replace the character that is assigned to `format-prefix`.