Update CODEOWNERS

Updating codeowners file for compute migration starting 8/19

Author: thomps23

CODEOWNERS

@@ -15,3 +15,7 @@
 /articles/mariadb @tynevi @thomps23
 /articles/mysql @tynevi @thomps23
 /articles/managed-instance-apache-cassandra @tynevi @thomps23
+/articles/virtual-machines @jasonwhowell @thomps23
+/articles/virtual-machines-scale-set @jasonwhowell @thomps23
+/articles/container-instances @jasonwhowell @thomps23
+/articles/service-fabric @jasonwhowell @thomps23