Add link to How it works blog post

readme.md

@@ -6,6 +6,7 @@ LessPass open source password manager (https://lesspass.com)
 ## How it works ?
 
  * [FR] [LessPass comment ça marche ?](https://blog.lesspass.com/lesspass-comment-%C3%A7a-marche-9f1201fffda5#.yjmd1bcad)
+ * [EN] [How it works ? ](https://blog.lesspass.com/lesspass-how-it-works-dde742dd18a4#.vbgschksh)
 
 ## LessPass submodules