Adding usage for oh-my-zsh

README.md

 # via theme for ZSH
 
+
 This is a theme for ZSH which mainly forks the historical theme used on
-VIA servers.
 
-It can be used with ZSH frameworks such as [Oh-My-Zsh](https://github.com/robbyrussell/oh-my-zsh).
+VIA servers. It can be used with ZSH frameworks such as [Oh-My-ZSH](https://github.com/robbyrussell/oh-my-zsh).
+
+
+## Usage
+
+### Install for Oh-My-ZSH
+
+In order to use this theme, you have to clone this repository in your Oh-My-ZSH
+
+`custom/themes` directory ( usually `~/.oh-my-zsh/custom/themes` ) :
+
+```
+git clone https://gitlab.my.ecp.fr/2014badourala/oh-my-via.git ~/.oh-my-zsh/custom/themes/oh-my-via
+```
+
+You then need to select this theme in your `~/.zshrc` :
+
+```
+ZSH_THEME="oh-my-via/via"
+```