Add CODEOWNERS file (#253)

Author: scottaddie

.github/CODEOWNERS

@@ -0,0 +1,5 @@
+# This file is used to automatically assign reviewers to PRs.
+# For more information, see https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
+
+# The '*' pattern represents global owners.
+*    @joseharriaga @trrwilson @ShivangiReja