Add a simple readme for usermgmt

components/usermgmt/README.md

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+# User management
+
+This module is responsible for manging users/groups/roles as well as being a frontend for the casbin internal service.
+All user/auth related requests go through here.
+
+
+## Development
+
+### Start kratos
+
+``` shell
+cd components/usermgmt/_kratos
+kratos serve -c kratos.yml
+```
+
+### Run usermgmt server
+
+``` shell
+cd components/usermgmt/_kratos
+go run main.go
+```
+