Create initial version of shard.

spec/golden-color_spec.cr

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+require "./spec_helper"
+
+describe GoldenColor do
+    describe ".from_rgb" do
+        it "Correctly creates a color from red, green and blue" do
+            c = GoldenColor::Color.from_rgb 0.0, 0.5, 1.0
+            c.r.should eq 0.0
+            c.g.should eq 0.5
+            c.b.should eq 1.0
+        end
+
+        it "Correctly creates a color from hue, saturation and value" do
+            c = GoldenColor::Color.from_hsv 0.0, 0.5, 0.95
+            c.r.should eq 0.95
+            c.g.should eq 0.475
+            c.b.should eq 0.475
+        end
+
+        it "Correctly reports a tuple of red, green, and blue" do
+            c = GoldenColor::Color.from_rgb 0.0, 0.5, 1.0
+            r, g, b = c.rgb
+            r.should eq c.r
+            g.should eq c.g
+            b.should eq c.b
+        end
+    end
+end

spec/spec_helper.cr

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+require "spec"
+require "../src/golden-color"