add a django testing with docker video and slides

[joke2k]

No description provided.

[s16h]

This sounds like a great video but I'm going to have to put merging on hold for now until we have other markdown files focusing on non-"built-in/pure" Python videos. Refer to #7 for further information.

Thanks a lot. I look forward to adding this video in the "web" category.

[merwok]

Agreed; the slides do a great job at explaining what Docker is, and give links to articles and projects to learn more, but don’t really go into anything specific to Django or Python; maybe the demo part in the video is more about Django, but I’m much more of a reader than a watcher :‑)