Add example macro for modifying the decay table

Author: jesgum

ALICE3/Macros/Configuration/decayTable_example.ini

@@ -0,0 +1,16 @@
+# Example decay table for the on-the-fly decayer (configurable "decayTable")
+# Overrides the TDatabasePDG decay channels of the listed mothers; unlisted particles are unaffected.
+# Format: <motherPdg>.<channelName>: <branchingRatio> <daughterPdg1> <daughterPdg2> ...
+# Branching ratios of each mother should sum to 1 (within 0.01); small deviations are renormalised.
+
+# Lambda -> p pi- only
+3122.ch0: 0.639 2212 -211
+-3122.ch0: 0.639 -2112 111
+
+# Lambda -> n pi0 only
+3122.ch1: 0.361 2112 111
+-3122.ch1: 0.361 -2112 111
+
+# Xi- -> Lambda pi-
+3312.ch0: 1.0 3122 -211
+-3312.ch0: 1.0 -3122 211