Add bin and edit workflow

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

@@ -0,0 +1,13 @@
+covers 'facets/math/percentile'
+
+test_case Math do
+
+  class_method :percentile do
+    test do
+      a = [1,1,2,2,3,3,3,4]
+      r = Math.percentile(a,75)
+      r.assert == 3.0
+    end
+  end
+
+end