Added ETL readme

3 jobs for beta in 37 minutes and 13 seconds (queued for 1 second)
Name Stage Failure
test Test

-- Docs:
======== 9 failed, 247 passed, 10 skipped, 9 warnings in 100.03 seconds ======== warning: Module /usr/lib/python3.4/site-packages/fractalis was never imported. (module-not-imported) warning: No data was collected. (no-data-collected)
ERROR: Failed to generate report: No data to report.

ERROR: Job failed: exit code 4