readme: make 2steps for oh-my-zsh installation explicit. (#1526)

README.md

@@ -366,18 +366,17 @@ make sure to disable the current theme in your plugin manager. See
 
 ### Oh My Zsh
 
-```zsh
-git clone --depth=1 https://github.com/romkatv/powerlevel10k.git ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/themes/powerlevel10k
-```
-
-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 ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/themes/powerlevel10k
-```
+1. Clone the repository:
+    ```zsh
+    git clone --depth=1 https://github.com/romkatv/powerlevel10k.git ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/themes/powerlevel10k
+    ```
+    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.
 
-Set `ZSH_THEME="powerlevel10k/powerlevel10k"` in `~/.zshrc`.
+    ```zsh
+    git clone --depth=1 https://gitee.com/romkatv/powerlevel10k.git ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/themes/powerlevel10k
+    ```
+2. Set `ZSH_THEME="powerlevel10k/powerlevel10k"` in `~/.zshrc`.
 
 ### Prezto