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Added README for event building toolchain, with reference to the ANNIE wiki page on how to properly event build.

configfiles/EventBuilder/README.md

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+# EventBuilder
+
+***********************
+## Description
+**********************
+
+The `EventBuilder` toolchain should be used to eventbuild for ANNIEEvents. The toolchain read in RAWData files, time match, and creates processed ANNIEEvents with Tank, CTC, and MRD information (currently no LAPPD information is included). This toolchain consolidated efforts to create an official event building toolchain for ANNIE, and should replace the `DataDecoder` toolchain, which is now considered depreciated. 
+
+Please consult the following ANNIE wiki page on how to event build: https://cdcvs.fnal.gov/redmine/projects/annie_experiment/wiki/Event_Building_with_ToolAnalysis
+
+************************
+## Tools
+************************
+
+The toolchain consists of the following tools:
+
+```
+LoadGeometry
+LoadRawData
+PMTDataDecoder
+MRDDataDecoder
+TriggerDataDecoder
+PhaseIIADCCalibrator
+PhaseIIADCHitFinder
+SaveConfigInfo
+ANNIEEventBuilder
+```