Update README with path-to-ads-config and moved disclaimer
Update README with path-to-ads-config and moved disclaimer

* Add path to ads config argument to README
* Move disclamer to the end of the file.

Change-Id: I2988b5f240acc5323e1fe56907ce2beb1a41d734

google/ads-api-report-fetcher,google/ads-api-report-fetcher,google/ads-api-report-fetcher,google/ads-api-report-fetcher