Add I2S example for M5Core2 in readme

[henrivw]

Description

Motivation and Context

Information

How Has This Been Tested?

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue with code or algorithm)
• New feature (non-breaking change which adds functionality to code)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)
• Unit Tests (add new Unit Test(s) or improved existing one(s), has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist:

• My code follows the code style of this project (only if there are changes in source code).
• My changes require an update to the documentation (there are changes that require the docs website to be updated).
• I have updated the documentation accordingly (the changes require an update on the docs in this repo).
• I have read the CONTRIBUTING document.
• I have tested everything locally and all new and existing tests passed (only if there are changes in source code).
• I have added new tests to cover my changes.

[dnfadmin]

All CLA requirements met.

[Ellerbach]

@henrivw please don't forget to sign the license so we can merge ;-) And thanks a lot for your contribution!

[Ellerbach]

@henrivw thanks again and please don't forget to sign the license/cla otherwise we won't be able to merge.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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[Ellerbach]

Thanks, looks good to me :-)

[nfbot]

@henrivw thank you again for your contribution! 🙏😄

.NET nanoFramework it's all about community involvement and no contribution is too small.
We would like to invite you to join the project Contributors list.

Please edit it and add an entry with your GitHub user in the appropriate location (names sorted alphabetically):

  <tr>
    <td><img src="https://github.com/henrivw.png?size=50&" height="50" width="50" ></td>
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