Update README.md

Co-authored-by: Brandon M Wilk <wilkb777@gmail.com>

Author: JmScherer

README.md

@@ -146,8 +146,10 @@ cd DITTO
 
 To run on UAB cheaha, see the [installation](#installation) step to clone the DITTO repository into a Cheaha directory.
 
-- Update the `.test_data/file_list.txt` (inout vcfs) files with complete file paths and submit a slurm job using the
-command below
+- Create a text file listing the path to VCF file(s) (1 path per line) with variants to score
+  - Paths can be full absolute paths **or** relative paths (relative to the directory where the pipeline will be run from, **not** the directory where the `pipeline.nf` file is)
+- See the example input file [.test_data/file_list.txt](.test_data/file_list.txt) (lists 2 testing example input VCFs) 
+  for reference or as an input file for testing (default behavior of `model.job`)
 
 ```bash
 /home/<username>/Workspace/DITTO/.test_data/oc_test_data.vcf.gz