add code owners (#101)

* add code ownders

* update code owners

Author: kaibocai

CODEOWNERS

@@ -0,0 +1,12 @@
+# See https://help.github.com/articles/about-codeowners/
+# for more info about CODEOWNERS file
+#
+# It uses the same pattern rule for gitignore file
+# https://git-scm.com/docs/gitignore#_pattern_format
+#
+
+#
+# AZURE FUNCTIONS TEAM
+# For all file changes, github would automatically include the following people in the PRs.
+#
+* @cgillum @kaibocai @shreyas-gopalakrishna