Add pythia pp 5.02 TeV to generators (#2098)

Author: hscheid

MC/config/ALICE3/ini/pythia8_pp_502tev.ini

@@ -0,0 +1,9 @@
+[Diamond]
+width[2]=6.0
+
+[GeneratorExternal]
+fileName=${O2DPG_MC_CONFIG_ROOT}/MC/config/ALICE3/pythia8/generator_pythia8_ALICE3.C
+funcName=generator_pythia8_ALICE3()
+
+[GeneratorPythia8]
+config=${O2DPG_MC_CONFIG_ROOT}/MC/config/ALICE3/pythia8/generator/pythia8_pp_502tev.cfg

MC/config/ALICE3/pythia8/generator/pythia8_pp_502tev.cfg

@@ -0,0 +1,16 @@
+### Specify beams
+Beams:idA = 2212
+Beams:idB = 2212            
+Beams:eCM = 5020.              ### energy
+    
+Beams:frameType = 1
+ParticleDecays:limitTau0 = on
+ParticleDecays:tau0Max = 10.      ### match alice: 1cm/c = 10.0mm/c
+
+### processes
+SoftQCD:inelastic = on # all inelastic processes
+
+# default: do nothing, Monash 2013 will do its thing
+Tune:pp = 14
+
+Random:setSeed = on