Add GOVERNANCE.md

Update and Rename OWNERS to MAINTAINERS.md
[ci skip]

GOVERNANCE.md

@@ -0,0 +1,3 @@
+# NATS Go Client Governance
+
+NATS Go Client (go-nats) is part of the NATS project and is subject to the [NATS Governance](https://github.com/nats-io/nats-general/blob/master/GOVERNANCE.md).

MAINTAINERS.md

@@ -0,0 +1,10 @@
+# Maintainers
+
+Maintainership is on a per project basis.
+
+### Core-maintainers
+  - Derek Collison <derek@nats.io> [@derekcollison](https://github.com/derekcollison)
+  - Ivan Kozlovic <ivan@nats.io> [@kozlovic](https://github.com/kozlovic)
+  
+### Maintainers
+  - Waldemar Quevedo <wally@nats.io> [@wallyqs](https://github.com/wallyqs)

OWNERS

@@ -1,7 +0,0 @@
-reviewers:
-  - derekcollison
-  - kozlovic
-  - wallyqs
-approvers:
-  - derekcollison
-  - kozlovic