Add tips readme document

[akrzos]

Add a tips readme document to cover things such as:

• Change version of OCP deployed by assisted-installer (minor version, major versions, nightly/ci versions)
• Setting specific machines for ibmcloud (vars: bastion_hardware_id, controlplane_hardware_ids, worker_hardware_ids, and sno_hardware_ids)
• Increasing max-pods during deployment timeframe (vars: kubelet_config, kubelet_config_max_pods, and cluster_network_host_prefix)
• Deploying etcd on nvme storage
• Using localstorage for PVs
• Deploying a 2nd cluster using the same bastion maybe