[PWGEM] LMee: added ini and json file for 13 TeV pp cocktail (#1844)

Author: jjungIKF

MC/config/PWGEM/ini/GeneratorEMCocktail_Run3pp.ini

@@ -0,0 +1,6 @@
+### The setup uses an external event generator
+### This part sets the path of the file and the function call to retrieve it
+
+[GeneratorExternal]
+fileName = ${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGEM/external/generator/GeneratorEMCocktailV2.C
+funcName=GenerateEMCocktail(200,0,3,127,"${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGEM/parametrizations/pp13TeV_run2.json","13TeV_MB_default",350,0.0,20.0,10000,1,1,0,0,"",0,1.1,"${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGEM/decaytables/decaytable_LMee.dat",1)