minor: document how to make use of the S3 Cake
minor: document how to make use of the S3 Cake

to incorporate the S3 library into a project that uses the cake pattern, you want to make use of the S3 library as a ‘subcake’ and use both the abstract spec and the concrete impl of the S3 cake
liruqi/aws-wrap,dwhjames/aws-wrap,dwhjames/aws-wrap,liruqi/aws-wrap