Update README.md

Author: dhernandez0

README.md

@@ -1,3 +1,33 @@
 # show_stixels
 
 Code to generate stixels image from .stixels format, for more details check [Stixels World on the GPU](https://github.com/dhernandez0/stixels/)
+
+## How to compile and test
+
+Simply use CMake and target the output directory as "build". In command line this would be (from the project root folder):
+
+```
+mkdir build
+cd build
+cmake ..
+make
+```
+
+## How to use it
+
+Type: `./show_stixels dir max_disparity`
+
+The argument `max_disparity` is the maximum disparity of the given disparity images.
+
+`dir` is the name of the directory which needs this format:
+
+```
+dir
+---- left (images taken from the left camera)
+---- right (right camera)
+---- disparities (disparity maps)
+---- stixels (.stixels files)
+---- stixlesim (results will be here)
+```
+
+An example is provided, to run it type: `./stixels ./example 128`