Adding a readme for wdmergers

Exec/science/wdmerger/README

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+# This contains information about the input parameters that can be used for running WD mergers
+
+# Easiest way to start a merger
+# Ref: https://articles.adsabs.harvard.edu/pdf/1983ApJ...268..368E
+problem.roche_radius_factor = 1.0e0
+
+# To set the CO mass fractions and He shell mass for WDs with  masses between 0.45 M_sun and 0.60 M_sun,use
+problem.hybrid_wd_c_frac = 0.00e0
+problem.hybrid_wd_o_frac = 0.00e0
+problem.hybrid_wd_he_shell_mass = 0.00e0
+
+# To set the CO mass fractions and He shell mass for WDs with masses between 0.6 M_sun and 1.05 M_sun, use
+problem.co_wd_c_frac = 0.00e0
+problem.co_wd_o_frac = 0.00e0
+problem.co_wd_he_shell_mass = 0.00e0
+
+