Added Lambda (Mod) Theme

External-themes.md

@@ -109,3 +109,11 @@ author: [Schminitz](https://github.com/schminitz)/[@Schminitz](https://twitter.c
 See [odin](https://github.com/tylerreckart/odin) for source.
 
 author: [@tylerreckart](https://github.com/tylerreckart)
+
+#### Lambda (Mod) theme
+
+![Screenshot](https://raw.githubusercontent.com/halfo/lambda-mod-zsh-theme/master/screenshot.png)
+- A simple yet elegant theme with git focused development
+See [lambda-mod](https://github.com/halfo/lambda-mod-zsh-theme/) for source.
+
+author: [@halfo](https://github.com/halfo)