Update README

[chlunde]

We need an updated README and marketplace entry on https://marketplace.upbound.io/providers/crossplane-contrib/provider-aws/v0.42.0 updated to clearly reflect the state of how this project is maintained and the alternatives, to ensure users make a correct and informed choice of provider.

I think the active maintainers, currently @MisterMX and I should agree on some wording about how issues and new feature requests are handled. Roughly, we maintain the features that are here, but PRs for new resource types and maintenance of the is welcome. Ideally we can get some help from Upbound, like @jeanduplessis, to have a good well balanced text for new end users regarding choice of provider. The text should probably be fairly static so it does not need updating.

At least, we should avoid having users pick this provider because of a misunderstanding the license of the upjet provider.

[jeanduplessis]

I'd be happy to assist here.

[github-actions]

Crossplane does not currently have enough maintainers to address every issue and pull request. This issue has been automatically marked as stale because it has had no activity in the last 90 days. It will be closed in 14 days if no further activity occurs. Leaving a comment starting with /fresh will mark this issue as not stale.

[github-actions]

Crossplane does not currently have enough maintainers to address every issue and pull request. This issue has been automatically marked as stale because it has had no activity in the last 90 days. It will be closed in 14 days if no further activity occurs. Leaving a comment starting with /fresh will mark this issue as not stale.

[MisterMX]

/fresh