Create mapping MapPicture

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+Make your map sexy !  
+Your map should include a preview picture. This picture will be visible from the game menu and from the servers vote screen.
+
+In order to do so:
+*  Load your map in the game
+*  Use the command `r_letterbox -1` in the console to turn off the HUD
+*  If your map has "waypoint" entities (like CTF or CTS maps), you can hide them with `cl_hidewaypoints 1`
+*  Take a nice screenshot with F12
+*  Go to your Xonotic user directory, on the `data/screenshot` subdirectory. Your user directory location depends on your operating system, more information [here](https://xonotic.org/faq/#where-are-the-configuration-files-located).
+*  Open the screenshot with an image editor, e.g. GIMP
+*  Crop it so that it has a 4:3 ratio
+*  Scale it to 512x512 px (weird but standard)
+*  Save it as a JPG file (~90% quality)
+*  Put it in the same location as the bsp file, with the same name (see next chapter for packaging rules).
+
+Original source of information: https://forums.xonotic.org/showthread.php?tid=6067&pid=75757#pid75757
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