update readme for output file

1 job for master in 26 seconds (queued for 1 second)
Name Stage Failure
build Test
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn <args> -rf :CityDoctorModel
Uploading artifacts for failed job
Uploading artifacts...
WARNING: CityDoctorParent/**/target/surefire-reports/TEST-*.xml: no matching files
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: exit code 1