add chinese translation for the reference to gitee.com

See #124.

Thanks, @ayalhw.

README.md

@@ -351,7 +351,8 @@ git clone --depth=1 https://github.com/romkatv/powerlevel10k.git ~/powerlevel10k
 echo 'source ~/powerlevel10k/powerlevel10k.zsh-theme' >>! ~/.zshrc
 ```
 
-Users in mainland China can use the official mirror on gitee.com for faster download.
+Users in mainland China can use the official mirror on gitee.com for faster download.<br>
+中国大陆用户可以使用 gitee.com 上的官方镜像加速下载.
 
 ```zsh
 git clone --depth=1 https://gitee.com/romkatv/powerlevel10k.git ~/powerlevel10k
@@ -368,7 +369,8 @@ make sure to disable the current theme in your plugin manager. See
 git clone --depth=1 https://github.com/romkatv/powerlevel10k.git ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/themes/powerlevel10k
 ```
 
-Users in mainland China can use the official mirror on gitee.com for faster download.
+Users in mainland China can use the official mirror on gitee.com for faster download.<br>
+中国大陆用户可以使用 gitee.com 上的官方镜像加速下载.
 
 ```zsh
 git clone --depth=1 https://gitee.com/romkatv/powerlevel10k.git ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/themes/powerlevel10k