feat(External-Themes): add simplerich theme (#40)

External-themes.md

@@ -10,6 +10,36 @@ You can also use Github's search to find `*.zsh-theme` files:
 
 Check out the instructions [here](https://github.com/ohmyzsh/ohmyzsh/wiki/Customization#overriding-and-adding-themes).
 
+---
+<div align="center">
+
+### Simplerich Theme
+
+#### *Informative Git Status, Anaconda Environment Info and Command Execution Time.*
+
+![Simplerich](https://github.com/philip82148/simplerich-zsh-theme/blob/main/readme/demo.png)
+
+</div>
+
+#### Features
+
+You can see the followings at once:
+
+- Real Time
+- Login User
+- Working Directory
+- Anaconda's Environment Name
+- Rich Git Status
+
+After command execution, you can see also:
+
+- Command Execution Time
+- Success/Error Hint
+
+#### Install: [Install](https://github.com/philip82148/simplerich-zsh-theme#install)
+#### Source: [simplerich-zsh-theme](https://github.com/philip82148/simplerich-zsh-theme)
+#### Author: [@philip82148](https://github.com/philip82148)
+
 ---
 <div align="center">