Add enrichment contribute.md

[eaglei15]

Adding Enrich as a supported ability for the tools

[joshbressers]

Thanks for the PR @eaglei15

I agree that enrich should be an ability

Can you also add it to the Schema
https://github.com/ossf/sbom-everywhere/blob/main/SBOM-Catalog/schemas/data.yaml#L13

@Mariuxdeangelo I'll give you the final ack or nack on the name as you've gotten us this far (I feel like this makes sense though)

[Mariuxdeangelo]

I also think this is a good idea. Do you have any tool in mind that already falls under this ability?