Add error description to message to improve exception quality

[JoshuaBehrens]

In case of a misconfiguration one does only get an "invalid_client" as messages which can be anything regarding to Microsoft.

With the description in addition you can get helpful messages like:

invalid_client
AADSTS50011: The reply URL specified in the request does not match the reply URLs configured for the application: '12345678-1234-1234-1234-1234567890ab'.
  Trace ID: 12345678-1234-1234-1234-1234567890ab
  Correlation ID: 12345678-1234-1234-1234-1234567890ab
  Timestamp: 2020-01-07 10:00:00Z

[hajekj]

Awesome! Thanks for the PR! This is now merged to master!

[JoshuaBehrens]

Thanks for merging this. So I can update my application 👍