Add README.md

Author: ShellCode33

README.md

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+# backlightd
+
+This tool aims to manage the backlight of all your monitors (laptop + external ones) at the same time.
+
+Some alternatives exist but they all have some drawbacks:
+
+- brightnessctl : unable to manage external monitors unless you install an out-of-tree kernel module
+- ddcutil : unable to manage laptops' builtin monitor + extremely slow
+- clightd : written in C, prone to bugs and vulnerabilities (its daemon runs as root)
+
+Features:
+
+- Automatically adjust brightness based on sunrise/sunset at your location.
+- Allows you to take over and manually set the desired brightness
+- Caching mechanism which enables way more reactive external monitors brightness change than ddcutil would by default.
+
+Roadmap:
+
+- Change color temperature of monitors
+- Support luminescence sensors