added links to a tank and tankcontroller

simulation/example.md

@@ -23,8 +23,8 @@ To perform a simulation we need the following:
 
 Download the folowing FMU's
 
-* [tank]()
-* [tankcontroller]()
+* [tank](http://overture.au.dk/into-cps/test/fmu/tank.fmu)
+* [tankcontroller](http://overture.au.dk/into-cps/test/fmu/tankcontroller.fmu)
 
 Also fetch the COE, see the download page.