Create Machine Learning Tutorials with Flux.jl

Hello prospective hacktoberfest contributor! The FluxML community would welcome new tutorials to the Flux website which can generally be found under: https://fluxml.ai/tutorials.html

You can find the source code for the tutorials here: https://github.com/FluxML/fluxml.github.io/tree/main/tutorials/_posts. They are just markdown files.

## What we are looking for

We would be open to Pull Request which provide a tutorial topic that is not already covered by the existing tutorials. But no need to re-invent the wheel here. If you have a favorite tutorial that you want to try and re-create using Flux, we would love to help and see it!

Find out more about contributing here: https://github.com/FluxML/fluxml.github.io/blob/main/CONTRIBUTING.md and more general ways of contributing (which may not be open hacktoberfest issues but we can happily make them into issues if that helps you) here: https://github.com/FluxML/Flux.jl/blob/master/CONTRIBUTING.md

Another good starting place would be the Model Zoo: https://github.com/FluxML/model-zoo where we have a bunch of existing models but usually without tutorials built around them.