adding README
adding README

Change-Id: Ibae7ea4457a9289fb344f05c43f7df87ca270855

shahrzadmn/vaadin-grid,manolo/components,shahrzadmn/vaadin-grid,jforge/components,jforge/components,jforge/components,manolo/components,shahrzadmn/vaadin-grid,manolo/components,shahrzadmn/vaadin-grid