Add igwn-segments

[duncanmmacleod]

This PR adds a recipe for igwn-segments, which is a fork of ligo-segments.

Checklist

• Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml".
• License file is packaged (see here for an example).
• Source is from official source.
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• Build number is 0.
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• GitHub users listed in the maintainer section have posted a comment confirming they are willing to be listed there.
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[github-actions]

Hi! This is the staged-recipes linter and I found some lint.

File-specific lints and/or hints:

• recipes/igwn-segments/meta.yaml:
  • lints:
    • The following maintainers have not yet confirmed that they are willing to be listed here: lpsinger, titodalcanton. Please ask them to comment on this PR if they are.

[duncanmmacleod]

@titodalcanton, @lpsinger, please comment here to indicate that you are happy to be named as co-maintainers of this recipe.

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/igwn-segments/meta.yaml) and found it was in an excellent condition.