Update README.md

sample_syn/README.md

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 This direcotry contains synthetic dataset for testing RF_INV. Note that the dataset here is paricuraly 'easy' dataset that are tuned such that one can obtain resonable solutions quickly. For application to real dataset, you will need ~100 times more iterations. DON'T copy & paste the parameter file here for your dataset without noticing this. 
 
+* Uniform reference velocity model (Vp = 5.0 km/s, Vs = 2.89 km/s)
+* Vp is fixed
+* Noise level (sigma) is fixed
+* Multiple inputs with different ray parameters
+
 ## Usage
 1.  `mkdir rslt`
 1.  `mpirun -np 20 ../bin/rf_inv params.in`