Added GitHub citation file.

[mainrs]

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Docs change / refactoring / dependency upgrade

Motivation and Context / Related issue

GitHub introduces the citation file format to make it easier to discover and work with software that can be cited. Following the already provided citation inside the README, I created the corresponding citation file.

Similar to https://github.com/pytorch/pytorch, a new Cite this repository button will now be displayed on the right-hand side of the webpage inside the About section (see attached screenshot).

There are two things I'd like to point out:

1. The citation type is now software instead of the original article. This can be changed using a preferred-citation key according to the official GitHub documentation.
2. PyTorch has an organization attached to its citation. If this is applicable here too, then the file needs to be edited.

How Has This Been Tested (if it applies)

Checklist

• [ ] The documentation is up-to-date with the changes I made.
• [ ] I have read the CONTRIBUTING document and completed the CLA (see CONTRIBUTING).
• [ ] All tests passed, and additional code has been covered with new tests.

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