Add README to krisleech theme

themes/krisleech/README.md

+## krisleech
+
+A very simple ZSH theme optimized for Git. Less is more.
+
+![krisleech theme](https://f.cloud.github.com/assets/66143/930316/732ea576-0008-11e3-964c-98410709d00c.png)
+![krisleech theme](https://f.cloud.github.com/assets/66143/930317/73446046-0008-11e3-8ecb-2abec0058b83.png)
+
+### Characteristics
+
+* Current working directory
+* Branch name
+* Dirty working directory (✘)