Add release notes for version 3.8.0

Author: pmai

content/index.adoc

@@ -105,6 +105,7 @@ include::./general_docs/bibliography.adoc[leveloffset=+1]
 == Release Notes
 :sectnums!:
 
+include::./appendix/releases/v03.08.adoc[leveloffset=+2]
 include::./appendix/releases/v03.07.adoc[leveloffset=+2]
 include::./appendix/releases/v03.06.adoc[leveloffset=+2]
 include::./appendix/releases/v03.05.adoc[leveloffset=+2]