Add howto for CML on Nutanix and Proxmox (#49)

* add howto for nutanix and proxmox

* moved howto to new documentation folder

documentation/cml_on_proxmox.md

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+### CML on Proxmox
+
+##### Requirements:
+- Installed and configured Proxmox node (or cluster) from https://www.proxmox.com/en/downloads
+- Downloaded CML installation ISO/OVA and refplat ISO image
+
+##### Install CML from ISO
+
+- Import install and refplat ISOs via GUI (Folder View / Storage / local storage / ISO images / Upload or Download from URL)
+If upload is not working (wrong file extension error), copy ISO files to /var/lib/vz/template/iso/ (or any other ISO compatible storage) on Proxmox host via shell.
+- Start creating new VM
+- General tab
+  - fill VM name
+- OS tab
+  - switch storage to one where ISOs were uploaded
+  - select CML install ISO from ISO image dropdown
+- System tab
+  - select VirtIO SCSI single controller
+  - switch BIOS to OVMF (UEFI)
+  - select some storage for EFI disk
+- Disks tab
+  - set disk size to at least 32GB
+- CPU tab
+  - set needed number of Sockets and Cores
+  - CPU type must be set to 'host' to support nested virtualization
+- Memory tab
+  - set amount of memory
+- Network tab
+  - choose correct network/MTU etc for first interface (if more interfaces are needed, they must be added after VM creation via Hardware / Add / Network Device option)
+
+Finish VM creation. Start VM and follow install instructions. Switch install iso for refplat when needed.
+
+##### Install CML from OVA
+
+- Import reflat ISO via GUI (Folder View / Storage / local storage / ISO images / Upload or Download from URL)
+If upload is not working (wrong file extension error), copy ISO file to /var/lib/vz/template/iso/ (or any other ISO compatible storage) on Proxmox host via shell.
+- Copy OVA file to folder for example /var/lib/vz/template/ova/ on Proxmox host.
+- Unzip OVA with 'tar -xf cml2_2.7.0-5_amd64-21.ova' command.
+- From /var/lib/vz/template/ova/ run import commad: `qm importovf 107 cml2_2.7.0-5_amd64-21_SHA256.ovf local-lvm`. 107 is VM id, choose some not used already, and local-lvm is VMs storage.
+- Go to Proxmox GUI and open newly created VM (id 107 in our case).
+- Edit HW of VM:
+  - switch BIOS to OVMF (UEFI)
+  - add new HW 'EFI disk'
+  - set processor type to 'host'
+  - change SCSI controller to 'VirtIO SCSI single'
+  - add Network Device and set model to 'VirtIO Paravirtualized' (add more NICs if needed)
+  - add CD/DVD Drive and select appropriate storage and iso image
+
+Boot VM and complete CML installaion