"How-to make" guide

**Describe the solution you'd like**
It would be great if there was a "how-to" written or video guide that shows how you can make an image viewer like the one in this repo. This would be helpful for anyone getting started with Tkinter!

This guide could be in the repo and/or The Dev Community and/or LinkedIn and/or somewhere else!

You have the end product on here, reverse engineer it to understand how you would make one yourself, and write/talk it through in a guide!

~This issue is open to being worked on for Hacktoberfest, comment below if you have any questions and/or would like to work on it! First come first serve. ~ - Assigned, but feel free to checkout the other issues currently in the repo or create your own!