Windows support currently unclear

[buhtz]

When I read the current README.md I am not sure if (nativ!) Windows is supported or not.

Can you please clear this up if Windows is supported.

If not but if Windows Linux Subsystem or MinGW or anything else would work it would also be nice to know.

Currently I receive a QT specific error on my system.

>>> import gtabview
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\IUK\Python\lib\site-packages\gtabview\__init__.py", line 11, in <module>
    from .viewer import QtGui, QtCore, QtWidgets
  File "C:\IUK\Python\lib\site-packages\gtabview\viewer.py", line 5, in <module>
    from .qtpy import QtCore, QtGui, QtWidgets
  File "C:\IUK\Python\lib\site-packages\gtabview\qtpy.py", line 36, in <module>
    if os.environ['QT_API'] == 'pyqt5':
  File "C:\IUK\Python\lib\os.py", line 679, in __getitem__
    raise KeyError(key) from None
KeyError: 'QT_API'

Because I am not the admin here I can not say it it would help to just install a QT runtime.