Salesforce-Workday Integration- User Creation

I have setup the Salesforce-Workday integration in my project.

Now as part of next step, I want to create user Accounts in salesforce mapping the user details from Workday.

i.e When salesforce admin enters the email address of new user in Salesforce, then on clicking save button, it should automatically start finding the corresponding user in Workday with same email address and autopopulate the user details in Salesforce with Workday user details.