[ENH] Diagnosis Levels with correct API response #49

[tvilight4]

• Closes Identify levels of diagnosis #49

Changes proposed in this pull request:

• Addition of levels of the diagnosis.
• Adding the code to the API code so that the levels are reflected in the API output.

Checklist

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• PR has an interpretable title with a prefix ([ENH], [FIX], [REF], [TST], [CI], [MNT], [INF], [MODEL], [DOC]) (see our Contributing Guidelines for more info)
• PR has a label for the release changelog or skip-release (to be applied by maintainers only)
• PR links to GitHub issue with mention Closes #XXXX
• Tests pass
• Checks pass

For new features:

• Tests have been added

For bug fixes:

• There is at least one test that would fail under the original bug conditions.

[barbarastrasser]

The code runs and does what it should do :) I have left some minor comments. The important are the ones about the test and the file location - this would be good to address before merging. Everything else is just about print statements - we can also leave them in if you prefer :)