Add bin and edit workflow

bin/gems/facets-3.1.0/test/standard/math/test_coth.rb

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+require 'facets/math/coth'
+require 'facets/numeric/range'  # used to test within a precision
+
+test_case Math do
+
+  class_method :coth do
+    test do
+      Math.coth(1.0).range(1.0e-6).assert === 1.0 / Math.tanh(1.0)
+      Math.coth(2.0).range(1.0e-6).assert === 1.0 / Math.tanh(2.0)
+    end
+  end
+
+end