add docs

Author: a-hariti

docs/contributing/pages/components.mdx

@@ -37,6 +37,18 @@ An Alert component with no level setting will render as a Note component.
 
 See also the [Note component](#note).
 
+## Arcade embeds
+
+Render an [Arcade](arcade.software) embed.
+<Arcade src="https://demo.arcade.software/v7uhzmdV6Q5PDzoVPAE6?embed&show_copy_link=true" />
+```markdown {tabTitle:Example}
+<Arcade src="https://demo.arcade.software/v7uhzmdV6Q5PDzoVPAE6?embed&show_copy_link=true" />
+```
+
+Attributes:
+
+- `src` (string) - the URL of the Arcade embed
+
 ## Expandable
 
 Render an expandable section.