Added src directory

src/triangle.rb

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+# Triangle Project Code.
+
+# Triangle analyzes the lengths of the sides of a triangle
+# (represented by a, b and c) and returns the type of triangle.
+#
+# It returns:
+#   :equilateral  if all sides are equal
+#   :isosceles    if exactly 2 sides are equal
+#   :scalene      if no sides are equal
+#
+# The tests for this method can be found in
+#   about_triangle_project.rb
+# and
+#   about_triangle_project_2.rb
+#
+def triangle(a, b, c)
+  # WRITE THIS CODE
+  #--
+  a, b, c = [a, b, c].sort
+  fail TriangleError if (a+b) <= c
+  sides = [a, b, c].uniq
+  [nil, :equilateral, :isosceles, :scalene][sides.size]
+  #++
+end
+
+# Error class used in part 2.  No need to change this code.
+class TriangleError < StandardError
+end