feat: add `stats/base/dists/boltzmann/pmf`

[AgPriyanshu18]

Resolves #179 .

Description

What is the purpose of this pull request?

this pull request added the package stats/base/dists/boltzmann/pmf

This pull request:

• a Resolves #179
• b
• c

Related Issues

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This pull request:

• resolves #
• fixes #

Questions

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No.

Other

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No.

Checklist

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

• [x] Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[kgryte]

You shouldn't be manually adding test fixtures. You should be using our test fixtures scripts. In this case, you should test against SciPy. See other packages which test against SciPy.