Add a RSS feed for the blog posts

Hi,

would it be possible to add a RSS-feed for the blog posts? (https://gridsome.org/blog/)

A plugin search yields two options:
- https://gridsome.org/plugins/gridsome-plugin-rss (seems a bit more active)
- https://gridsome.org/plugins/gridsome-plugin-feed

Are you willing to accept a PR which would implement this feature ?
Do you have any guidance regarding the implementation ?

thanks

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Fun fact: I just read this comment from @tomtev https://github.com/gridsome/gridsome/issues/147#issuecomment-466767855

> Great plugin @darthmeme blushtada It’s live on gridsome.org. I will close this now

and I thought that it meant that the rss feed was integrated inside gridsome, but I think it actually means that the plugin is listed there: https://gridsome.org/plugins/gridsome-plugin-rss