Updated External themes (markdown)

External-themes.md

@@ -7,6 +7,18 @@ 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).
 
+---
+#### passion
+
+![passion](https://raw.githubusercontent.com/ChesterYue/ohmyzsh-theme-passion/master/passion.gif)
+
+* time prompt will update once you finish inputting.
+* time cost will show after command running.
+
+source: [repo](https://github.com/ChesterYue/ohmyzsh-theme-passion)
+
+author: [@chesteryue](https://github.com/ChesterYue)
+
 ---
 #### fishy 2.0