Re: Robots.txt file is not found on my website, how do I add it?

The only time that you need a robots.txt file is if you have pages that you do not want Google to crawl. If everything is available, if you have no robots.txt file it will return a 404 error and Google will continue to crawl the site.  See: https://support.google.com/webmasters/answer/2409682?hl=en