Created How to run (markdown)

How-to-run.md

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+# How to run 
+
+This application can be launched from an IDE, or from a shell (linux or Windows). 
+You will need a config.json configuration file (see default_config.json for a template). 
+You can use your own scenario file (osm.sumocfg file), see : http://sumo.dlr.de/wiki/Tutorials. 
+
+**With a Shell:**
+
+`py ./emissions.py` 
+
+Will launch a simulation with the default_config.json file.
+
+`py ./emissions.py -f configs/config1.json -save`
+
+Will load the configuration file "config1.json" and save logs into the logs directory 
+    
+`py ./emissions.py -f configs/config1.json -save -ref`
+
+By using -ref option it will launch a reference simulation (without acting on infrastructure and vehicles) 
+