Add builder pattern for paragraph, lists, tables

lib/ezdoc/nodes/list.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+module Ezdoc
+  module Nodes
+    class List < Base
+      attr_reader :items, :type, :num_id
+
+      def initialize(type:, num_id:)
+        super()
+        @type = type
+        @num_id = num_id
+        @items = []
+      end
+
+      def add_item(item)
+        @items << item
+      end
+    end
+  end
+end