Add new exercise: markdown

[SleeplessByte]

problem specification | description | canonical data

You may find it helpful to follow this checklist from the CONTRIBUTING.md resource.

[0xBradock]

Hello, can I give it a try?

[SleeplessByte]

Yes! Go for it <3

[0xBradock]

Hello,

I have a question.

After successfully populating the .meta/tests.toml with ./bin/configlet sync --update, is there a way to make the same for the tests in <slug>.spec.js?

Thanks,

[junedev]

@KMelow No, the JavaScript track does not have a test case generator. You need to write the test file yourself.

[SleeplessByte]

This was done.