Add README and .gitignore

.gitignore

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+*~
+*.png
+*.pdf
+.svn/
+*.d
+*.so

README

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+README for dmplottools
+author: Ben Loer
+
+These tools are used to create plots about dark matter interactions with 
+common detector materials, and standard exclusion plots. The files are ROOT
+macros, and should be run like
+ > root macro.C
+
+The macros that would normally be invoked are:
+
+- PlotVdist.C: Plot the average WIMP velocity distribution in the lab frame
+- PlotRecoilSpectrum.C: Plot the differential spectrum of nuclear recoils 
+  			generated by WIMP interactions
+- PlotIntegralRate.C: Plot the total WIMP-induced nuclear recoil rate above 
+  		      threshold as a function of threshold energy
+- PlotModulationAmplitude.C: Plot the annual modulation of the rate of 
+  			     WIMP-induced nuclear recoils as a fraction
+			     of the total recoil rate above threshold
+- PlotExclusionLimits.C: As it stands, this plots the WIMP-nucleon cross 
+     section sensitivity as a function of WIMP mass for an ideal DarkSide-50
+     detector, using the TRolke method. It can be modified to use other 
+     calculations, as well as other isotopes and masses. It also includes
+     out-of-date limits from CDMS, XENON, CoGeNT and DAMA.
+
+
+Plot Variables:
+Adjusting the labels, masses, etc. requires directly editing the relevant macro.
+However, parameters about the WIMP mass and velocity distribution can be 
+edited in the StandardVars.C macro, which is referenced by all the other macros.