Initial structure for matchers

src/spectator/matchers/equality_matcher.cr

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+require "./matcher"
+
+def eq(expected : T) forall T
+  Spectator::Matchers::EqualityMatcher(T).new(expected)
+end
+
+module Spectator
+  module Matchers
+    class EqualityMatcher(T) < Matcher
+      def initialize(@expected : T)
+      end
+
+      def match?(expectation : Expectation)
+        expectation.actual == @expected
+      end
+    end
+  end
+end

src/spectator/matchers/matcher.cr

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+module Spectator
+  module Matchers
+    abstract class Matcher
+      abstract def match?(expectation : Expectation)
+    end
+  end
+end

src/spectator/mathers.cr

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+require "./matchers/*"
+
+module Spectator
+  module Matchers
+  end
+end