Add Microsoft Store badge to README

Added a Microsoft Store badge to the README.

Author: AustinATTS

README.md

@@ -7,6 +7,10 @@
 
 [![Windows Build Status](https://github.com/AustinATTS/split_loaf/actions/workflows/build.yml/badge.svg)](https://github.com/AustinATTS/split_loaf/actions/workflows/build.yml)  [![Linux Build Status](https://github.com/AustinATTS/split_loaf/actions/workflows/build_linux.yml/badge.svg)](https://github.com/AustinATTS/split_loaf/actions/workflows/build_linux.yml)
 
+<a href="https://apps.microsoft.com/detail/9nfhj4ptjxkv?referrer=appbadge&mode=direct">
+	<img src="https://get.microsoft.com/images/en-us%20light.svg" width="200"/>
+</a>
+
 Overview
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