Added tvOS tests, SPI shields (#26)

Author: bdrelling

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
     uses: AudioKit/ci/.github/workflows/swift_test.yml@main
     with:
       scheme: SoundpipeAudioKit
-      platforms: iOS macOS
+      platforms: iOS macOS tvOS
       swift-versions: 5.5 5.6
 
   # Send notification to Discord on failure.
@@ -22,4 +22,4 @@ jobs:
     uses: AudioKit/ci/.github/workflows/send_notification.yml@main
     needs: [swift_test]
     if: ${{ failure() && github.ref == 'refs/heads/main' }}
-    secrets: inherit
+    secrets: inherit

README.md

@@ -5,7 +5,8 @@
 
 [![Build Status](https://github.com/AudioKit/SoundpipeAudioKit/workflows/CI/badge.svg)](https://github.com/AudioKit/SoundpipeAudioKit/actions?query=workflow%3ACI)
 [![License](https://img.shields.io/github/license/AudioKit/SoundpipeAudioKit)](https://github.com/AudioKit/SoundpipeAudioKit/blob/main/LICENSE)
-[![Platform](https://img.shields.io/cocoapods/p/AudioKit)](https://github.com/AudioKit/AudioKit/)
+[![Swift Compatibility](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2FAudioKit%2FSoundpipeAudioKit%2Fbadge%3Ftype%3Dswift-versions&label=)](https://swiftpackageindex.com/AudioKit/SoundpipeAudioKit)
+ [![Platform Compatibility](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2FAudioKit%2FSoundpipeAudioKit%2Fbadge%3Ftype%3Dplatforms&label=)](https://swiftpackageindex.com/AudioKit/SoundpipeAudioKit)
 [![Reviewed by Hound](https://img.shields.io/badge/Reviewed_by-Hound-8E64B0.svg)](https://houndci.com)
 [![Twitter Follow](https://img.shields.io/twitter/follow/AudioKitPro.svg?style=social)](https://twitter.com/AudioKitPro)