Add OpenJDK version 15#1458

Merged

simon04 merged 3 commits intofreeCodeCamp:masterfrom

MasterEnoc:openjdk

Feb 2, 2021

Commits on Jan 4, 2021

Add Openjdk version 13, 14, 15 and 16
MasterEnoc
committed

Commits on Jan 30, 2021

Remove openjdk16 and improve syntax highlight
MasterEnoc
committed

Commits on Feb 2, 2021

Remove openjdk14, openjdk13
simon04
committed