Add builder pattern for paragraph, lists, tables

lib/ezdoc/xml/relationships.rb

@@ -22,9 +22,21 @@ module Ezdoc
     class DocumentRelationships
       NAMESPACE = "http://schemas.openxmlformats.org/package/2006/relationships"
 
+      def initialize(has_numbering: false)
+        @has_numbering = has_numbering
+      end
+
       def to_xml
         builder = Nokogiri::XML::Builder.new(encoding: "UTF-8") do |xml|
-          xml.Relationships(xmlns: NAMESPACE)
+          xml.Relationships(xmlns: NAMESPACE) do
+            if @has_numbering
+              xml.Relationship(
+                Id: "rId1",
+                Type: "http://schemas.openxmlformats.org/officeDocument/2006/relationships/numbering",
+                Target: "numbering.xml"
+              )
+            end
+          end
         end
         builder.to_xml
       end