New README file for fast simulation

(Hermine)

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+$Id$
+
+How to test the fast simulation for MUON.
+
+The macro "fastMUONGen.C" allows to generate events using the 
+AliGenMUONCocktailpp generator. In the current implementation, the 
+generator is set up in order to force all generated particles to decay
+within Pythia, including the muonic decay of pions and kaons:
+gener->SetDecayModePythia(kAllMuonic); 
+By changing the argument from "kAllMuonic" back to "kAll" one can
+leave it up to GEANT to do these decays. 
+In addition, we require that the "trigger muons" - whose number 
+(single- or dimuon trigger or MB trigger),
+specified as the third argument of fastMUONGen.C - must have their origin
+before the hadron absorber in order to "simulate" GEANT:
+gener->SetMuonOriginCut(-130.);
+
+The output of this generation ("galice.root" and "Kinematic.root")
+can then be processed by the macro "fastMUONSim.C" that produces a
+root file, called "fastSim_pp.root". It uses the "fast generator" to
+simulate the detector response.  The output file contains
+TClonesArrays holding AliMUONTrackLight and AliMUONPairLight objects
+that are built on the basis of the surviving muons.
+
+Both macros can be run from fastSim.sh test script.
+
+