Add prompt documentation

modules/prompt/README.md

@@ -0,0 +1,24 @@
+Prompt
+======
+
+Load prompt [themes][1].
+
+Settings
+--------
+
+### Theme selection
+
+To select a prompt theme, add the following to zshrc, and replace 'name' with
+the name of the theme you wish to load. Setting it to random will load a random
+theme.
+
+    zstyle ':omz:module:prompt' theme 'name'
+
+Authors
+-------
+
+*The authors of this module should be contacted via the github bug tracker.*
+
+ - [Sorin Ionescu](/sorin-ionescu)
+
+[1]: http://zsh.sourceforge.net/Doc/Release/User-Contributions.html#Prompt-Themes