Add nilo19 to the owner list of the provider azure.

Author: nilo19

staging/src/k8s.io/legacy-cloud-providers/azure/OWNERS

@@ -6,6 +6,7 @@ approvers:
 - feiskyer
 - karataliu
 - khenidak
+- nilo19
 reviewers:
 - andyzhangx
 - aramase
@@ -15,3 +16,4 @@ reviewers:
 - karataliu
 - khenidak
 - ritazh
+- nilo19