virtualboxvm: add page (#2759)

pages/common/virtualboxvm.md

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+# virtualboxvm
+
+> The VirtualBox virtual machine management CLI.
+
+- Start a virtual machine:
+
+`virtualboxvm --startvm {{name|uuid}}`
+
+- Start a virtual machine in fullscreen mode:
+
+`virtualboxvm --startvm {{name|uuid}} --fullscreen`
+
+- Mount the specified DVD image file:
+
+`virtualboxvm --startvm {{name|uuid}} --dvd {{path/to/image_file}}`
+
+- Display a command line window with debug information:
+
+`virtualboxvm --startvm {{name|uuid}} --debug-command-line`
+
+- Start a virtual machine in a paused state:
+
+`virtualboxvm --startvm {{name|uuid}} --start-paused`