Add Swift Package Index badges to README

Added GitHub stars badge to README.

Signed-off-by: Christopher Jr Riley <chrisjr@cjrriley.com>

Author: MasterJ93

README.md

@@ -8,6 +8,12 @@
 
 <div align="center">
 
+[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2FATProtoKit%2FATLexiconTools%2Fbadge%3Ftype%3Dplatforms)](https://swiftpackageindex.com/ATProtoKit/ATLexiconTools)
+[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2FATProtoKit%2FATLexiconTools%2Fbadge%3Ftype%3Dswift-versions)](https://swiftpackageindex.com/ATProtoKit/ATLexiconTools)
+
+</div>
+<div align="center">
+
 [![GitHub Repo stars](https://img.shields.io/github/stars/ATProtoKit/ATLexiconTools?style=flat&logo=GitHub)](https://github.com/ATProtoKit/ATLexiconTools)
 
 </div>