Create README.md

README.md

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+# Light 🔆
+Lightweight unix console app for brightness control.
+
+## Examples
+Get
+```
+$ light
+> 128/255 (50%)
+```
+Set
+```
+$ light 100
+> 100/255 (39%)
+
+$ light 70%
+> 179/255 (70%)
+```
+Increment
+```
+$ light -29
+> 150/255 (58%)
+
+$ light +5%
+> 161/255 (61%)
+```
+
+## Install
+1. Clone the repository
+   ```sh
+   git clone https://github.com/dekabu/light
+   cd light
+   ```
+2. Determine where the `brightness` and `max_brightness` files are located on your system
+   (*/sys/class/backlight/amdgpu_bl0/\** by default)
+> [!WARNING]
+> Make sure your user has write access to the `brightness` file.
+
+3. Correct define in `light.c`
+   ```c
+   6. #define PREFIX <put your prefix>
+   ```
+
+4. Build
+   ```
+   make
+   ```
+
+5. Install
+   ```
+   make install
+   ```