📖 Update docs/README.md with virtualcluster flavor

[christopherhein]

User Story

As an operator I would like to use clusterctl to deploy a VC backed CAPN by following the quickstart so I don't need to have tribal knowledge.

Detailed Description

After #136 is merged and a release is cut we should make sure we update the readme to reflect deploying CAPN + VC as an option.

/kind documentation
/milestone v0.1.x

[nobody4t]

/assign

[christopherhein]

hey @dongwangdw we probably need to make sure we have #129 and #130 done for this to be done properly just an FYI as this might be on hold.

[nobody4t]

@christopherhein
OK. Thanks for the info. It seems there are couples of items should be achived before this one.
I will have my eye on this.

[christopherhein]

Update to use released binary - curl -L https://github.com/kubernetes-sigs/cluster-api/releases/download/v0.4.0/clusterctl-linux-amd64 -o clusterctl

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[christopherhein]

/remove-lifecycle stale
/lifecycle frozen