code: public HelpersBuilder addIf(String elseStartDelimiter, String elseEndDelimiter) {
          builder.put(IF, new IfHelper(elseStartDelimiter, elseEndDelimiter));
          return this;
      }
docs: Add an instance of {@link IfHelper} with the {@value #IF} name and the given else delimiters.
  
  @return self