Style your feed

[dstroot]

Is your feature request related to a problem? Please describe.
Not a problem. It would be nice to be able to signify/associate an xml stylesheet. See: https://darekkay.com/blog/rss-styling/.

Describe the solution you'd like
Add a object field to the feed object to contain the rss stylesheet name, and if present, write it into the rss xml.

Describe alternatives you've considered
None.

Additional context
This is the motivation: https://darekkay.com/blog/rss-styling/.