Added index to ngXosLib documentation

Change-Id: Idee78870216616e84e4a3c40f66e1e19ef38ef2c
diff --git a/views/ngXosLib/xosHelpers/src/index.ngdoc.js b/views/ngXosLib/xosHelpers/src/index.ngdoc.js
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+/**
+* @ngdoc overview
+* @name ngXosLib
+* @id index
+* @description
+* # Welcome to the ngXosLib documentation! <br/>
+* This is the module that group all the helpers service and UI components for XOS.
+* <br/><br/>
+* You can find all the documentation related to the UI Component Library here: <a href="#/module/xos.uiComponents"> xos.uiComponents</a> <br/>
+* and the documentation related to all the other helpers here: <a href="#/module/xos.helpers"> xos.helpers</a> <br/>
+**/
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