### Summary

- Adds a banner image to README

### Test plan

- Make sure the README is rendered properly.

In a future version of Nitro, you will be able to import types
(HybridObjects) from other libraries. For the import to work seamlessly,
nitrogen needs to read the other library's `nitro.json` so it knows
which C++/Android/Swift namespace to import to resolve the foreign type.
That's why the `nitro.json` file should be part of the npm package! :)

Enables support for 16 KB page sizes on Android.

Each Native Module library will need to add this for themselves too in
their `build.gradle` file if they want to support 16 KB page sizes, but
it's good to have it in the template now I think.

See [Support 16 KB page
sizes](https://developer.android.com/guide/practices/page-sizes) for
more information.

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