adding css snippet: prefers-contrast: more

[skodamarthi]

What Changed

Fixes https://github.com/intuit/accessibility-snippets/issues/36

Why

Todo:

• [ ] Add Semantic Version Label
• [ ] Add tests
• [ ] Add docs

[skodamarthi]

@kendallgassner Can you please review?

[kendallgassner]

Thank you for taking the time to contribute @skodamarthi! It looks like someone already picked up this issue and has made a pr. Typically If you want to begin working on an issue you write a comment on the bottom of the issue explaining that you will be making a contribution -- this way two people do not accidentally make the same pr https://github.com/intuit/accessibility-snippets/issues/36