Android example implementation for MNIST

[Scramjet911]

Feature description

I have used burn with android and made a sample MNIST image detection app.
I would love to contribute to the examples after cleaning it up a little.
Would give users an idea of how things are done and the capabilities

Feature motivation

Planning on implementing on device learning with Rust.

(Optional) Suggest a Solution

You can see my app here.
Please don't mind the weird naming/ comments..

[laggui]

That's awesome! It would be a great addition to the examples if you want to submit a PR for that 😎

Since these types of examples are a bit more involved, it would be nice to have a brief step-by-step to get to the end results (especially for building / deploying for the target platform) 🙏

[antimora]

It would be more awesome if we have a book section on this subject too.

[Scramjet911]

I'll add a PR with the examples and add a readme in that. Once that is verified we could maybe look into adding it to the book with modifications...

[Scramjet911]

Added a pr with the android example. The local tests ran successfully. The Readme is in casual language though and I have not touched the android tests folders.