Add empty screen mockup

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<svg

   width="450"

   height="300"

   viewBox="0 0 119.0625 79.375"

   version="1.1"

   id="svg1"

   inkscape:version="1.4 (e7c3feb100, 2024-10-09)"

   sodipodi:docname="empty_screen.svg"

   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"

   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"

   xmlns="http://www.w3.org/2000/svg"

   xmlns:svg="http://www.w3.org/2000/svg">

  <sodipodi:namedview

     id="namedview1"

     pagecolor="#ffffff"

     bordercolor="#000000"

     borderopacity="0.25"

     inkscape:showpageshadow="2"

     inkscape:pageopacity="0.0"

     inkscape:pagecheckerboard="0"

     inkscape:deskcolor="#d1d1d1"

     inkscape:document-units="mm"

     inkscape:zoom="1"

     inkscape:cx="188"

     inkscape:cy="134"

     inkscape:window-width="1920"

     inkscape:window-height="1008"

     inkscape:window-x="0"

     inkscape:window-y="0"

     inkscape:window-maximized="1"

     inkscape:current-layer="layer1" />

  <defs

     id="defs1" />

  <g

     inkscape:label="Ebene 1"

     inkscape:groupmode="layer"

     id="layer1" />

</svg>