Adds Bullet train theme

External-themes.md

@@ -25,3 +25,24 @@ A theme based on agnoster, but with a lot more features (like flexible segments,
 See [Repo](https://github.com/bhilburn/powerlevel9k) for source
 
 author: [@bhilburn](https://github.com/bhilburn)
+
+#### Bullet train
+
+![powerlevel9k theme](https://camo.githubusercontent.com/c5b0c78df1c3ca27bb2c5577114a92018bbdbee0/687474703a2f2f7261772e6769746875622e636f6d2f6361696f676f6e64696d2f62756c6c65742d747261696e2d6f682d6d792d7a73682d7468656d652f6d61737465722f696d672f707265766965772e676966)
+
+Bullet Train is a oh-my-zsh shell theme based on the Powerline Vim plugin. It aims for simplicity, showing information only when it's relevant.
+
+It currently shows:
+
+- Current Python virtualenv
+- Current Ruby version and gemset, through RVM
+- Current Node.js version, through NVM
+- Git status
+- Timestamp
+- Current directory
+- Background jobs
+- Exit code of last command
+
+See [Repo](https://github.com/caiogondim/bullet-train-oh-my-zsh-theme) for source
+
+author: [@caiogondim](https://github.com/caiogondim)