add help on config.

Author: kdaily

README.md

@@ -12,10 +12,12 @@ devtools::install_github("Sage-Bionetworks/synapseusagereports")
 
 Scripts are in the [inst/scripts](inst/scripts) directory.
 
+See [example-db-config.yml](example-db-config.yml) for an example configuration file to connect to the warehouse database.
+
 ### Query the warehouse
 
 ```
-report_data_query.R --project_id=syn1234567 --start_date=2018-01-01 --end_date=2018-03-01 --config_file=~/datawarehouse-config.yml > output.csv
+report_data_query.R --project_id=syn1234567 --start_date=2018-01-01 --end_date=2018-03-01 --config_file=example-db-config.yml > output.csv
 ```
 
 ### Generate a report