As an API Consumer, I want a REST API endpoint that retrieves the user identity
Related Issue: #7 (closed)
Acceptance Criteria
- A route that returns the user identity - see the OpenAPI definition
- It should deal with predictable errors such as 401, 403, etc
- Unit tests for the http rest method using the flask test client
Definition of Done
A valid REST API endpoint that follows the OpenAPI spec and can be used from any HTTP client tool such as swagger, curl, etc.