Update README.md

Author: tlambert03

README.md

@@ -19,3 +19,9 @@ Currently, this will run something like:
 > ```
 
 (see https://github.com/tlambert03/setup-qt-libs/blob/main/index.js for current code)
+
+**See also**:  
+[pyvista/setup-headless-display-action](https://github.com/pyvista/setup-headless-display-action),
+which additionally prepares both windows and linux for offscreen opengl tests,
+and, when used with the [qt option]([pyvista/setup-headless-display-action](https://github.com/pyvista/setup-headless-display-action#options)),
+can replace this action