Add very short qt demo program

mwcraig · mwcraig · commit 9189b0e49775 · 2020-02-17T08:27:48.000-06:00
diff --git a/Demos_no_notebook/qt.py b/Demos_no_notebook/qt.py
@@ -0,0 +1,3 @@
+from vpython import *
+set_browser(type='pyqt')
+b = box()
