chore: create CODEOWNERS (#3)

* chore: create CODEOWNERS

* Update CODEOWNERS

Author: busunkim96

.github/CODEOWNERS

@@ -0,0 +1,11 @@
+# Code owners file.
+# This file controls who is tagged for review for any given pull request.
+#
+# For syntax help see:
+# https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
+
+# yoshi-python is the default owner
+*                                      @googleapis/yoshi-python
+
+# The python-samples-owners team is the default owner for samples
+/samples/**/*.py                       @dizcology @googleapis/python-samples-owners