(feat) added badges to readme

README.md

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 # Swift Serial
 
+[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Fmredig%2FSwiftSerial%2Fbadge%3Ftype%3Dswift-versions)](https://swiftpackageindex.com/mredig/SwiftSerial) [![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Fmredig%2FSwiftSerial%2Fbadge%3Ftype%3Dplatforms)](https://swiftpackageindex.com/mredig/SwiftSerial)
+
 This project began its life as yeokm1's [SwiftSerial](https://github.com/yeokm1/SwiftSerial). He has since archived the project and was kind enough to link this project going forward.
 
 ### Getting started