adds codeowners file to repo (#36)

* adds codeowners file to repo

* move codeowners out of workflows folder

.github/CODEOWNERS

@@ -0,0 +1,7 @@
+# Please sort lines alphabetically, this will ensure we don't accidentally add duplicates.
+#
+# https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
+
+# The following owners will be the default owners for everything in the repo.
+# Unless a later match takes precedence
+@bitwarden/team-auth-dev