Adding C# OOP into the Get Started with SplashKit GPIO

[breezy-codes]

Description

Updated this tutorial to now include the OOP version of splashkit, also added in the astro Steps feature for the steps part of this guide.

Type of change

• Language Update

Testing Checklist

• Tested in latest Firefox
• npm run build
• npm run preview

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

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