New maintainers and reviewers. Creating an owners file that the ci-bots can work with.

OWNERS

@@ -0,0 +1,9 @@
+reviewers:
+  - ksubrmnn (Kalya Subramanian)
+  - madhanrm (Madhan Raj Mookkandy)
+  - rajatchopra (Rajat Chopra)
+  - tomdee (Tom Denham)
+approvers:
+  - philips (Brandon Philips)
+  - rajatchopra
+  - tomdee