Create CODEOWNERS (#472)

* Create CODEOWNERS

* Update CODEOWNERS

* Rename CODEOWNERS to .github/CODEOWNERS

Author: willarmiros

.github/CODEOWNERS

@@ -0,0 +1,11 @@
+#####################################################
+#
+# List of approvers for this repository
+#
+#####################################################
+#
+# Learn about CODEOWNERS file format:
+#  https://help.github.com/en/articles/about-code-owners
+#
+
+* @aws/aws-x-ray