chore(breadcrumbs): Add STYLES.md file for custom CSS properties and …

…classes

projects/angular/src/layout/breadcrumbs/STYLES.md

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+# Breadcrumbs
+
+## CSS Custom Properties
+
+| CSS Custom Property          | Description                 |
+| ---------------------------- | --------------------------- |
+| --clr-breadcrumb-link-color  | Breadcrumb item link color  |
+| --clr-breadcrumb-item-space  | Breadcrumb item spacing     |
+| --clr-breadcrumb-font-weight | Breadcrumb item font weight |
+| --clr-breadcrumb-font-size   | Breadcrumb item font size   |
+| --clr-breadcrumb-line-height | Breadcrumb item line height |
+
+## CSS Classes
+
+| Class name            | Description                              |
+| --------------------- | ---------------------------------------- |
+| clr-breadcrumb        | Breadcrumb element                       |
+| clr-breadcrumb-menu   | Breadcrumb menu                          |
+| clr-breadcrumb-item   | Breadcrumb menu item                     |
+| clr-breadcrumb-expand | Breadcrumb expand control                |
+| active                | Current breadcrumb in the page hierarchy |