#271: Document how to enable the software renderer

README.md

@@ -35,7 +35,8 @@ If you'd like to help translate Ludusavi into other languages,
 ## Installation
 ### Requirements
 * Ludusavi is available for Windows, Linux, and Mac.
-* Your system must support OpenGL.
+* Your system must support one of DirectX, Vulkan, or Metal.
+  (If not, set the `ICED_BACKEND` environment variable to `tiny-skia` to use the software renderer.)
 
 ### Methods
 You can install Ludusavi one of these ways:
@@ -686,6 +687,9 @@ cross-platform and cross-store solution:
     It should be fixed once Windows Terminal v1.17 is released.
     In the meantime, you can work around it by opening Windows Terminal from the Start Menu,
     opening its settings, and changing the "default terminal application" to "Windows Console Host".
+* The GUI won't launch.
+  * There may be an issue with your graphics drivers/support.
+    Try using the software renderer instead by setting the `ICED_BACKEND` environment variable to  `tiny-skia`.
 
 ## Development
 Please refer to [CONTRIBUTING.md](./CONTRIBUTING.md).