chore(breadcrumbs): Add STYLES.md file for custom CSS properties & classes

[andyfeds]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• If applicable, have a visual design approval

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: CDE-2533

What is the new behavior?

Documented the custom CSS properties and classes for the breadcrumbs component.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[github-actions]

👋 @andyfeds,

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🤖 Clarity Release Bot

[sandeepkulki]

Approving CSS changes

[valentin-mladenov]

Those 3 properties are not used anywhere. You can safely delete them from code as well.

Suggested change

	| --clr-breadcrumb-font-weight | Breadcrumb item font weight |
	| --clr-breadcrumb-font-size | Breadcrumb item font size |
	| --clr-breadcrumb-line-height | Breadcrumb item line height |