Update README.md

Author: itruf

README.md

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 A Swift library for parsing incomplete or streaming JSON data. Perfect for handling truncated JSON responses, streaming APIs, or progressive JSON parsing scenarios.
 
+## Star History
+
+[![Star History Chart](https://api.star-history.com/svg?repos=itruf/PartialJSON&type=date&legend=top-left)](https://www.star-history.com/#itruf/PartialJSON&type=date&legend=top-left)
+
 ## Features
 
 - ✅ Parse incomplete JSON strings that are truncated or still being streamed