Add doc for ibmcloud

[mkumatag]

PR for IBMCloud documentation

xref: https://issues.redhat.com/browse/MULTIARCH-1938

[mkumatag]

/cc @joelddiaz @akhil-rane

[joelddiaz]

/lgtm

[joelddiaz]

/assign @jeana-redhat @lwan-wanglin @sferich888
I expect this is the last PR related to enabling IBMCloud support in this repo. No functionaly changes here, just documenting what has been done and how to use it.

[joelddiaz]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[jeana-redhat]

lgtm, just left a question that will be relevant for user docs. If you want to add that to this, I can hold off on the docs label - lmk

[lwan-wanglin]

/label qe-approved

[mkumatag]

@jeana-redhat @sferich888 ping

[jeana-redhat]

Thanks for the ping! I was out last week and missed the earlier comment :)

/label docs-approved

[sferich888]

/label px-approved