Add PyMIF to tools

[erickmartins]

PyMIF (https://github.com/grinic/pymif) is a project that reads, views (using napari) and converts from a bunch of file formats to OME-Zarr (including support for NGFF 0.5!). Probably worth adding to converters and readers/writers section!

[lubianat]

@erickmartins thanks and good timing as #466 is hot