Add concurrent-swiss-map

[mhmtszr]

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• I have read the Contribution Guidelines
• I have read the Maintainers Note
• I have read the Quality Standards

Not every repository (project) will require every option, but most projects should. Check the Contribution Guidelines for details.

• The repo documentation has a pkg.go.dev link.
• The repo documentation has a coverage service link.
• The repo documentation has a goreportcard link.
• The repo has a version-numbered release and a go.mod file.
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Please provide some links to your package to ease the review

• forge link (github.com, gitlab.com, etc): https://github.com/mhmtszr/concurrent-swiss-map
• pkg.go.dev: https://pkg.go.dev/github.com/mhmtszr/concurrent-swiss-map
• goreportcard.com: https://goreportcard.com/report/github.com/mhmtszr/concurrent-swiss-map
• coverage service link (codecov, coveralls, etc.): https://app.codecov.io/gh/mhmtszr/concurrent-swiss-map

Pull Request content

• The package has been added to the list in alphabetical order.
• The package has an appropriate description with correct grammar.
• As far as I know, the package has not been listed here before.

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Packages added a long time ago might not meet the current guidelines anymore. It would be very helpful if you could check 3-5 packages above and below your submission to ensure that they also still meet the Quality Standards.

Please delete one of the following lines:

• The packages around my addition still meet the Quality Standards.

[github-actions]

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• repo link
• pkg.go.dev
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• coverage

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