Update README.md

Author: ChenZhao44

README.md

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 A full-featured Julia package for ZX-calculus, and a circuit simplification engine for the Julia quantum compiler, [YaoLang](https://github.com/QuantumBFS/YaoLang.jl). (GSoC 2020).
 
-For a brief introduction to ZXCalculus, please check [this blog post](https://chenzhao44.github.io/2020/08/27/ZXCalculus.jl/).
+For a brief introduction to ZXCalculus, please check [this notebook](https://github.com/ChenZhao44/ZXCalculusTutorials) or [this blog post](https://chenzhao44.github.io/2020/08/27/ZXCalculus.jl/).
 
 ## Installation