Added release notes for 3.8.0
Added release notes for 3.8.0

remold/OpenConext-engineblock,thijskh/OpenConext-engineblock,remold/OpenConext-engineblock,rjkip/OpenConext-engineblock,thijskh/OpenConext-engineblock,remold/OpenConext-engineblock,remold/OpenConext-engineblock,Martin1982/OpenConext-engineblock,rjkip/OpenConext-engineblock,Martin1982/OpenConext-engineblock,rjkip/OpenConext-engineblock,thijskh/OpenConext-engineblock,Martin1982/OpenConext-engineblock,thijskh/OpenConext-engineblock,rjkip/OpenConext-engineblock,Martin1982/OpenConext-engineblock