added hints for the installation of the latex beamer theme

presentations/Tutorenschlung/README.md

@@ -17,6 +17,11 @@ yourself to the "templates" folder:
  * semirounded.sty
  * tikzuml.sty
 
+You can find those files at [sdqweb.idp.kit.edu](http://sdqweb.ipd.kit.edu/wiki/Dokumentvorlagen).
+
 and the following files to the "logos" folder:
  * kitlogo_de_rgb.eps
  * your `titleimage`
+
+evantually, you need the font "Arial". You can find it here:
+[ftp.dante.de](ftp://ftp.dante.de/tex-archive/fonts/urw/arial.zip)