dosbox: add page

pages/common/dosbox.md

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+# dosbox
+
+> MS-DOS emulator to run legacy DOS applications and games.
+> More information: <https://www.dosbox.com/wiki/Usage>.
+
+- Start DOSBox with default settings:
+
+`dosbox`
+
+- Run a DOS executable located at a specific path:
+
+`dosbox {{path/to/executable.exe}}`
+
+- Mount a folder as C: and run an executable:
+
+`dosbox {{path/to/executable.exe}} -c "MOUNT C {{path/to/folder}}"`
+
+- Start DOSBox in fullscreen mode:
+
+`dosbox -fullscreen`
+
+- Exit DOSBox automatically after running a program:
+
+`dosbox {{path/to/executable.exe}} -exit`