code: function Plugin() {
  
      this.name = "Audit-Plugin";
      this.resources = new Map();
      this.duplicateContents = new Map();
      this.inLinks = new Map();
      this.outLinks = new Map();
      this.externalLinks = new Map();
      this.unparsedLinks =  new Set();
      this.images = new Map();
      this.errors = new Set();
      this.redirects = new Map();
  
  
  }
docs: Basic crawler plugin that can be used to make a SEO audit for one site
  This is just an example that requires some customizations
  
  @param : the crawler engine that will emit events to this plugin