Update README.md, add Swift and Platform Compatibility

Author: leoho0722

README.md

@@ -1,5 +1,8 @@
 # SFSymbolsGenerator
 
+[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Fleoho0722%2FSFSymbolsGenerator%2Fbadge%3Ftype%3Dswift-versions)](https://swiftpackageindex.com/leoho0722/SFSymbolsGenerator)
+[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Fleoho0722%2FSFSymbolsGenerator%2Fbadge%3Ftype%3Dplatforms)](https://swiftpackageindex.com/leoho0722/SFSymbolsGenerator)
+
 Simplifying SF Symbols Enumeration Generation with Swift!
 
 ## Currently Support States