Create README.md

README for the new RWM fitting tool

UserTools/FitRWMWaveform/README.md

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+# FitRWMWaveform
+
+FitRWMWaveform tool takes the auxilliary channel waveforms saved in the Processed Data and peforms rising edge fitting to determine the rising edge time. 
+
+Currently the two auxillary waveforms are the Booster RF and the Booster RWM signals (https://github.com/ANNIEsoft/ToolAnalysis/blob/ff86893aa905652621594f8ac093be45f3bd13b5/configfiles/LoadGeometry/AuxChannels.csv#L5).
+
+Motivation for this tool and details of the waveform shape and fitting can be found here: https://annie-docdb.fnal.gov/cgi-bin/sso/ProcessDocumentAdd 
+
+## Data
+
+The tool will populate the following objects (all `double` datatype):
+
+### RWM fits
+* **RWMRisingStart**: Time where the RWM trace crosses predefined threshold
+* **RWMRisingEnd**: Time where RWM trace crosses below predefined threshold (at the end)
+* **RWMHalfRising**: Time where the RWM rising edge crosses 50% of its maximum above baseline.
+* **RWMFHWM**: FWHM of the RWM waveform (sorry for the typo).
+* **RWMFirstPeak**: After the rising edge of the RWM trace, there is often a sharp peak. This the time of this first peak.
+
+### BRF fit
+* **BRFFirstPeak**: For the BRF waveform, fit of the first BRF pulse. 
+* **BRFAveragePeak** The average (or baseline) y-value (in ADC) of the signal across the entire window.
+* **BRFFirstPeakFit** Fit for the half-rising time of the first BRF pulse.
+
+
+## Configuration
+
+Configuration variables for FitRWMWaveform.
+
+```
+verbosityFitRWMWaveform 0             # verbosity level
+printToRootFile 1                     # 1 to print the RWM and BRF waveforms to an output root file, 0 for no printing
+maxPrintNumber 100                    # maximum number of waveforms to save to the output root file
+output_filename RWMBRFWaveforms.root  # name of the output root file
+```