update description

README.md

@@ -1,4 +1,17 @@
 redmine_advanced_roadmap_v2
 ===========================
 
-Fork of Redmine Plugin: advanced roadmap
+This plugin is a fork of Redmine Plugin: [advanced roadmap](https://redmine.ociotec.com/projects/advanced-roadmap)
+
+Installation
+============
+
+Steps:
+
+1.  Download last version 
+2.  Unzip in your Redmine folder /plugins
+3.  Rename the folder to advanced_roadmap
+4.  Into the Redmine root folder migrate plugins: `rake redmine:plugins:migrate`
+5.  Restart you Redmine.
+
+