Create swift mdupdate

[craigwllce]

Bug/issue #, if applicable:

Summary

Provide a description of what your PR addresses, explaining the expected user experience.
Also, provide an overview of your implementation.

Dependencies

Describe any dependencies this PR might have, such as an associated branch in another repository.

Testing

Describe how a reviewer can test the functionality of your PR. Provide test content to test with if
applicable.

Steps:

1. Provide setup instructions.
2. Explain in detail how the functionality can be tested.

Checklist

Make sure you check off the following items. If they cannot be completed, provide a reason.

• Added tests
• Ran the ./bin/test script and it succeeded
• Updated documentation if necessary

[d-ronnqvist]

Hello.

Please update your PR description to explain why are you adding this empty file and what it does.