postprocess.md

 # Post-processing of simulated data
+The folder `analysis/` contains a program that will help you analyze the simulated data.
+
+## Compilation
+```
+cmake ./
+make -j N
+```
+
+## Usage
+
+1. If you just want to add experimental resolution to a set of simulated data:
+```
+VKAdd -o output.root -r 0.06 input1.root
+```
+
+2. If you want add two sets of simulated data (summing):
+```
+VKAdd -o output.root -r 0.06 input1.root input2.root
+```
+
+3. If you want add a set of simulated data to itself (pile-up):
+```
+VKAdd -o output.root -r 0.06 -p input1.root
+```
+
+In the above examples the experimental resolution was set to sigma=6%. You can of course, chose any value you want.
  
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-* go to subdirectory analysis
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