add auth realm

src/mechanize/http/auth_realm.cr

@@ -0,0 +1,27 @@
+# This class represents realm attribute of www-authenticate header.
+class Mechanize::HTTP::AuthRealm
+  getter scheme : String
+  getter uri : URI
+  getter realm : String
+
+  def initialize(scheme, uri, realm)
+    @scheme = scheme
+    @uri = uri
+    @realm = realm if realm
+  end
+
+  def ==(other)
+    self.class === other and
+    @scheme == other.scheme and
+    @uri == other.uri and
+    @realm == other.realm
+  end
+
+  def hash # :nodoc:
+    [@scheme, @uri, @realm].hash
+  end
+
+  def inspect # :nodoc:
+    "#<AuthRealm %s %p \"%s\">" % [@scheme, @uri, @realm]
+  end
+end