feat(RubyLangDoc): support Ruby | 支持 Ruby

src/test/java/io/github/linwancen/plugin/show/demo/ruby.rb

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+lwc = Human.new("lwc")
+lwc.met1("Hi")
+
+# fun
+def fun(x,y)
+  fun2
+  fun3("Hi")
+  h = Human.new
+  h.met2
+end
+
+# fun2
+def fun2()
+
+end
+
+# fun3
+def fun3(msg)
+
+end
+
+# class
+class Human
+  # Human
+
+  # met1 #met2
+  def met1(msg)
+    met2
+  end
+
+  # met2
+  def met2
+
+  end
+
+end