Add some descriptions

README.md

@@ -7,3 +7,23 @@ Master: [![Build Status](https://travis-ci.org/DuneSt/MaterialColors.svg?branch=
 Master: [![Build status](https://ci.appveyor.com/api/projects/status/3dn6m0k68jjenk6v/branch/master?svg=true)](https://ci.appveyor.com/project/jecisc/materialcolors/branch/master) | Latest commit: [![Build status](https://ci.appveyor.com/api/projects/status/3dn6m0k68jjenk6v?svg=true)](https://ci.appveyor.com/project/jecisc/materialcolors) 
 
 A project to extends Pharo colors's classes with the Material Design recommandations
+
+## Install MaterialColors
+
+To install MaterialColors on your Pharo image you can just execute the following script: 
+
+    Metacello new
+    	githubUser: 'DuneSt' project: 'MaterialColors' commitish: 'master' path: 'src';
+    	baseline: 'MaterialColors';
+    	onWarningLog;
+    	load
+
+To add MaterialColors to your baseline just add this: 
+
+    spec
+    	baseline: 'MaterialColors'
+    	with: [ spec repository: 'github://DuneSt/MaterialColors:master/src' ]
+    	
+Note that you can replace the #master by another branch as #development or a tag as #v1.0.0.
+
+