Added devfile registry docs

[jc-berger]

Fixes #191 Define onboarding requirement

Taking content from John's devfile-registry docs repo: https://github.com/johnmcollier/registry-docs

I've left comments throughout the docs, asking questions to help direct peer reviewers' attention.

Thanks!

@johnmcollier or @GeekArthur would either of you take a look please to see how the devfile registry docs are looking?

[johnmcollier]

Generally looks fine to me. Just left a couple small comments

[jc-berger]

@johnmcollier if you could take another look and give it the LGTM if you think it looks good.

Apologies for the many commits...I accepted Rolfe's changes than made several myself, resulting in lots of commits! Thanks for the help!

[rolfedh]

One minor comment. Otherwise, /lgtm

[openshift-ci]

@rolfedh: changing LGTM is restricted to collaborators

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In response to this:

One minor comment. Otherwise, /lgtm

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[jc-berger]

@rkratky gotten the LTM from docs and devs. Please let me know if there's anything you would like me to address or change before you merge, thanks!

[rkratky]

@jc-berger, comments added.

[jc-berger]

@rkratky, addressed your comment and made some more changes in my new commit. Also, you'll see a comment I made pointing out the many uses of passive voice.

If you think it all looks fine, please go ahead and merge. Otherwise, I'm happy to continue to make changes. Thanks!

[openshift-ci]

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This pull-request has been approved by: jc-berger, johnmcollier, rkratky, rolfedh

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