Edit the config.yaml with your preferred subreddits, email to/from, user agent (to identify yourself to the Reddit API), and your Sendgrid credentials (free account). Optionally set your preferred cron run time (24h time format).
Run redditdaily.go to test it. Then run redditdaily_cron.go to run a long-running go process that will execute redditdaily when you specify it to.