Add OWNERS file

This should help the community know who they can turn to, but also
give credit to the maintainers for all their hard work.

Signed-off-by: Marc Khouzam <marc.khouzam@montreal.ca>

OWNERS

@@ -0,0 +1,8 @@
+maintainers:
+- spf13
+- jpmcb
+- jharshman
+- wfernandes
+- eparis
+- anthonyfok
+emeritus: