Add AWS s3 price example image

doc/S3.md

@@ -95,6 +95,9 @@ Create a file called `lifecycle_policy.json` with the following contents:
 
 AWS S3 is a good choice if you're already using AWS for your server or are comfortable using AWS for other things.  If you're brand new to object storage and not using AWS already I'm not sure I'd recommend jumping into it just for Owncast.  There are other options.
 
+Here's some example usage and pricing for AWS S3:
+<img src="aws-price-usage.png"/>
+
 ### File expiration 
 
 You should expire old segments on your S3 bucket.  [Here are some instructions on how to do that.](https://docs.aws.amazon.com/AmazonS3/latest/user-guide/create-lifecycle.html)