Purpose: look up the authenticated web user's details.
URL: https://www.commcarehq.org/api/v0.5/identity/
Sample Response:
{
"id": "672bdfc8-3629-10e0-9e24-005057aa7fe5",
"username": "demo@dimagi.com",
"first_name": "Demo",
"last_name": "User",
"email": "demo@dimagi.com"
}