Add Gauss hypergeometric function

[jrreed83]

Resolves #122 .

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• [x] Read, understood, and followed the contributing guidelines, including the relevant style guides.
• [x] Read and understand the Code of Conduct.
• [x] Read and understood the licensing terms.
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Description

What is the purpose of this pull request?

This pull request:

• Add support for evaluating the Gauss hypergeometric function.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves #122

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

No.

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@stdlib-js/reviewers

[jrreed83]

There is still more work to do on testing and documentation, just wanted to get the pull request started.

[kgryte]

@jrreed83 Awesome!!!!!!!!!! Thank you so much for working on this!