add zero web framework entry (#172)

Author: im-ng

README.md

@@ -587,6 +587,7 @@ TOC is generated by [markdown-toc](https://github.com/jonschlinkert/markdown-toc
 - [floscodes/zerve](https://github.com/floscodes/zerve) - A simple framework for writing web services in Zig.
 - [deatil/zig-paseto](https://github.com/deatil/zig-paseto) - A PASETO (Platform-Agnostic SEcurity TOkens) library for Zig.
 - [nurulhudaapon/zx](https://github.com/nurulhudaapon/zx) - A full-stack web framework for Zig.
+- [im-ng/zero](https://github.com/im-ng/zero) - Simple and opinionated web framework written in Zig and aims to make microservices development in Zig easier.
 
 ## Web3 Framework