Use SpaceVim as a server

There are three terminals in the screen, upper left for SpaceVim running on NeoVim, and upper right for SpaceVim running on Vim, demonstrating that you can send a file to SpaceVim by command so that it can edit a file without opening extra Vim Windows.

This is somewhat similar to the emacsclient command for Emacs.

See: github.com/SpaceVim/Sp…