Document Metal3Cluster

[lentzi90]

Add a section in metal3-docs (if needed) "Custom Resources" under "Cluster-api-provider-metal3" for documentation regarding the custom resources in Cluster API provider Metal3. Under this section, create a page for Metal3Cluster.
Add the information from this page to it. Feel free to update and improve if you find things that could be fixed.

[lentzi90]

/good-first-issue
/triage accepted

[metal3-io-bot]

@lentzi90:
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Details

In response to this:

/good-first-issue
/triage accepted

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[metal3-io-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues will close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[Rozzii]

/remove-lifecycle stale

[metal3-io-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues will close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[tuminoid]

/remove-lifecycle stale
/lifecycle frozen