Cluster-api: Add documentation section with companies / products using Cluster API

[vincepri]

To give some space to users to add their own products or company to a list or table in the book. This issue is to gather a list of companies and relative descriptions regarding who uses Cluster API in the wild.

/kind documentation
/milestone Next

[detiber]

We probably need to break this up into a few different sections. For example, products that consume and build upon Cluster API should likely be grouped differently than end users directly consuming upstream Cluster API.

[rudoi]

I don't know if this fits into this issue but we'd be happy to detail _how_ we use it as well, if that info would be interesting to people reading the docs.

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[vincepri]

/lifecycle frozen

[sftim]

https://github.com/kubernetes/enhancements/blob/master/keps/sig-docs/20191020-doc-policies-for-third-party-content.md is about the main Kubernetes website not CAPI, but might still be relevant.

[vincepri]

/milestone v0.4.0

[vincepri]

/priority important-soon

[vincepri]

Action items:

• Add sections in the book
• Reach out to community folks, weekly meeting
• Send out an email to sig-cluster-lifecycle mailing list

Goal is to get it done before KubeCon US ~October

[sftim]

@vincepri do you think that this change fits with the spirit of https://github.com/kubernetes/enhancements/blob/master/keps/sig-docs/20191020-doc-policies-for-third-party-content.md ?

How about adding a blog article with a survey of the cluster API and uses in the wild, and then having the official documentation link to that article? To me, that feels like a better fit.

[sftim]

/sig docs

[vincepri]

Need some time to review the document next week, a blog post sounds good to me as well. I'd also like to see what other projects have done in this are.