Moving Kite Dataset API info from old guide per CDK-753.

Link to the old guide from which this came. This is just shards of information brought forward so they're not lost. This info should be woven into the samples before 1.0.

http://kitesdk.org/docs/current/kite-data/guide.html
CSV isn't supported as a dataset format you can write to. We can create a dataset around CSV files in a directory and use Kite to read data from it, but we don't support (or recommend) writing data in CSV format. I think we can remove the option from this discussion and include it later when discussing how to use Kite with existing data.