Added the release notes document, at version 2.1.1
Added the release notes document, at version 2.1.1

liquidJbilling/LT-Jbilling-MsgQ-3.1,liquidJbilling/LT-Jbilling-MsgQ-3.1,liquidJbilling/LT-Jbilling-MsgQ-3.1,liquidJbilling/LT-Jbilling-MsgQ-3.1