Add documentation on how to use kine

[afbjorklund]

It is possible to use kine instead of etcd, in k8s.

This allows using a SQL database, such as sqlite.

kubeadm init --config kubeadm-master.cfg --ignore-preflight-errors ExternalEtcdVersion

The main issue is with generating the certificates...

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https://github.com/rancher/kine

Can be ran standalone so any k8s (not just k3s) can use Kine

etcd:
  external:
    endpoints:
    - http://k3s:2379
    caFile: ./ca.crt
    certFile: ./server.crt
    keyFile: ./server.key

Minimal example of using kine