add zack (#93)

Author: ddogfoodd

README.md

@@ -632,3 +632,4 @@ TOC is generated by [markdown-toc](https://github.com/jonschlinkert/markdown-toc
 - [Zigistry/Zigistry](https://github.com/Zigistry/Zigistry): A place where you can find all the libraries that suit your Zig lang needs.
 - [freref/fancy-cat](https://github.com/freref/fancy-cat): PDF reader inside the terminal.
 - [ghostty](https://github.com/ghostty-org/ghostty): Modern terminal emulator written in zig.
+- [zerotech-studio/zack](https://github.com/zerotech-studio/zack) : Backtesting engine for trading strategies, written in Zig.