[FEATURE] Brightness Control

[Akash6222]

Describe the improvement

• Keybind for controlling the brightness
• Add Icon on panel

Why do we need this?

Following points will specify the reason for including this Feature:-

• Easily able to control the brightness
• Easily able to access through panel

Terms and Conditions

• I agree to follow this project's Code of Conduct

[demonkillerr]

Requires xfce4-power-manager