Add scaffolding

[charleszheng44]

This PR adds the scaffolding generated by kubebuilder v3.

[christopherhein]

/assign

[christopherhein]

Fixes #19

[christopherhein]

We're going to need to regenerate this unfortunately and maybe to make this a little easier we should start with this PR only adding in the one type first, maybe NCP as a blank resource then we can add the rest of the types in individual PRs.

Specifically cause these we're generated with the wrong proper boilerplate so the license headers are messed up - https://github.com/kubernetes-sigs/cluster-api-provider-nested/blob/master/hack/boilerplate.go.txt and also the wrong domain and groups. https://github.com/kubernetes-sigs/cluster-api-provider-nested/blob/master/PROJECT#L2 should have been cluster.x-k8s.io and the groups for NCP, NKAS, NCM, NEtcd should all be under the group controlplane https://github.com/kubernetes-sigs/cluster-api-provider-nested/pull/24/files#diff-d1fb402f1269ba7396dca9cbd03b44ac055874669bce1d0f239fa2f54ea3584bR6.

[christopherhein]

We also should have these kinds under the v1alpha4 api instead of v1alpha1.

[christopherhein]

/lgtm
/approve

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