Add png signs

signs_png/37c3-notices-voc-saal-g-coord.png

signs_png/37c3-notices-voc-saal-g-mixer.png

signs_png/37c3-notices-voc-saal-z-av.png

signs_png/37c3-notices-voc-saal-z-cam1.png

signs_png/37c3-notices-voc-saal-z-cam2.png

signs_png/37c3-notices-voc-saal-z-coord.png

signs_png/37c3-notices-voc-saal-z-mixer.png

signs_png/37c3-notices-vogel.png

signs_png/37c3-notices-waescherei-dreckige-waesche.png

signs_png/37c3-notices-waescherei-saubere-waesche.png

signs_png/37c3-notices-weelchair-both.png

signs_png/37c3-notices-weelchair-down.png

signs_png/37c3-notices-weelchair-left-down.png

signs_png/37c3-notices-weelchair-left.png

signs_png/37c3-notices-weelchair-right-down.png

signs_png/37c3-notices-weelchair-right.png

...g/37c3-notices-where-is-the-infodesk-ask-the-infodesk.png