Add the qmuvi gallery to qmuvi github webpage

[garymooney]

Although the videos play fine in the qmuvi_gallery readme.md within the github repo, when the file is included in the github page, the videos do not render. Instead, the first frame is rendered as an overly large image. A possible solution to this could be to reupload the video with .mov appended to the end of the filename.

See: https://github.blog/2021-05-13-video-uploads-available-github/
and: https://stackoverflow.com/questions/4279611/how-to-embed-a-video-into-github-readme-md