Add read_cfg to README.md

README.md

@@ -75,6 +75,7 @@ A partial list of parameters are below. See the config file for a complete list.
 | `gpu_color`<br>`gpu_color`<br>`vram_color`<br>`ram_color`<br>`io_color`<br>`engine_color`<br>`frametime_color`<br>`background_color`<br>`text_color`         | Change default colors: `gpu_color=RRGGBB`|
 | `alpha`                            | Set the opacity of all text and frametime graph `0.0-1.0`                             |
 | `background_alpha`                 | Set the opacity of the background `0.0-1.0`                                           |
+| `read_cfg`                         | Add to MANGOHUD_CONFIG as first parameter to also load config file. Otherwise only MANGOHUD_CONFIG parameters are used. |
 
 Note: Width and Height are set automatically based on the font_size, but can be overridden.