docs: added twitter profile header example

[e-younan]

Description

This PR introduces a new example in the example project. In this new example, we implement the Twitter profile header using this library.

Motivation and Context

The reasoning behind adding this example is two-fold:

1. Add a more complex use case for developers to reference from
2. Observe the shortcomings of the library implementation to look for improvements.

How Has This Been Tested?

This implementation doesn't affect the library, so no testing is required. However, please note that this has only been tested heavily on iOS - Android has a bug that I have observed, but I will fix that in a future PR.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have followed the guidelines in the README.md file.
• I have updated the documentation as necessary.
• My changes generate no new warnings.

Screenshots

twitter-header.mov

Additional Notes

A blog post around the implementation is in the works. Stay tuned!