[ENH] Extract sex

[Raya679]

• Closes #8

Changes proposed in this pull request:

• Extracts sex from the user query
• If sex is not specified returns 'null'

Checklist

This section is for the PR reviewer

• [x] PR has an interpretable title with a prefix ([ENH], [FIX], [REF], [TST], [CI], [MNT], [INF], [MODEL], [DOC]) (see our Contributing Guidelines for more info)
• [x] PR has a label for the release changelog or skip-release (to be applied by maintainers only)
• [x] 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.

[Raya679]

Hi @rmanaem ,

• I tried running the very same query and got this anwer. I am not sure why this is happening, I will look into this, thanks for letting me know
• I will add the README.md and find the 0.2 equivalent to avoid the deprecated warning.

[Raya679]

This PR is no longer necessary as PR #15 is able to extract all the values (min_age, max_age, sex, diagnosis, is_control, assessment tool and image modality) at once.