Update cheatsheets

tldr/dos/boot

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, dos]
+source: https://github.com/tldr-pages/tldr.git
+---
+# BOOT
+
+> Boot floppy or hard disk images directly, bypassing OS emulation.
+> More information: <https://www.dosbox.com/wiki/BOOT>.
+
+- Boot from floppy image:
+
+`BOOT {{path/to/floppy.img}}`
+
+- Boot from hard disk image:
+
+`BOOT {{path/to/hard_disk.img}}`
+
+- Boot multiple floppy images:
+
+`BOOT {{path/to/floppy1.img path/to/floppy2.img ...}}`