iterm2 + zsh 环境配置

1. 先安装homebrew 和 iterm2

2. 从catalina开始，zsh是所有新建用户账户的默认shell，不需要重新安装。

3. 安装 oh-my-zsh 。

https://github.com/ohmyzsh/ohmyzsh

4. 安装 两个插件：

git clone https://github.com/zsh-users/zsh-syntax-highlighting ${ZSH_CUSTOM:-/.oh-my-zsh/custom}/plugins/zsh-syntax-highlighting
git clone https://github.com/zsh-users/zsh-autosuggestions ${ZSH_CUSTOM:-/.oh-my-zsh/custom}/plugins/zsh-autosuggestions

5.编辑.zshrc文件

6. 安装主题， powerlevel10k

https://github.com/romkatv/powerlevel10k#homebrew

7.安装colorls

https://github.com/athityakumar/colorls
sudo gem install colorls

8.代码统计工具

brew install cloc