Added Systems Programming with Zig (#134)

Hi,

Stjepan from Manning here. I thought this title might be a good match for your list. Thank you for considering it.

Best,

Author: stjepanjurekovic

README.md

@@ -75,6 +75,7 @@ TOC is generated by [markdown-toc](https://github.com/jonschlinkert/markdown-toc
 - [Learning Zig](https://www.openmymind.net/learning_zig/) : This guide aims to make you comfortable with Zig. It assumes prior programming experience, though not in any particular language.
 - [Zig 圣经](https://course.ziglang.cc/) : 简单、快速地学习 Zig.
 - [Introduction to Zig - a project based book](https://pedropark99.github.io/zig-book/) : This is an open book by author `Pedro Duarte Faria` that provides an introduction to the Zig programming language, which is a new general-purpose, and low-level language for building robust and optimal software.
+- [Systems Programming with Zig](https://www.manning.com/books/systems-programming-with-zig) : This book teaches how to write quality, useful Zig applications without relying on libraries or frameworks.
 
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