Import existing virtual box machines to vagrant

• Package a .box file using the following command:

    vagrant package --base <vm_name> --output <output.box>
  
    # vm_name - Name of the existing virtual box vm
    # output.box - Output box file name
  

• Add newly created box file to vagrant using following command:

    vagrant box add <box_name> <output.box>
  
    # box_name - Name of vagrant box
    # output.box - Newly created box file