I created my own extension. I am adding below note to help anybody else who will need the same

acess admin_crud are some examples of extensions that comes along with the keystone installation itself

As you can see any extension will have a seperate directory inside the contrib directory of keystone installation. It has primarily two python files in it 1) __init__.py 2) core.py (you can see controllers and routers here)

This is a standard naming convention followed by all keystone extensions and we will also follow it. “backends” is a folder which has all the database or any ldap related operations.

Restart the keystone service once you have created it.