Create README.md

Author: shanedsnyder

log-collection-analysis/fs-interface-usage/README.md

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+**extract-fs-interface-data.py**
+
+This script calculates aggregate job statistics to each storage system using each interface. The results are stored in a CSV file that is fed to other plotting scripts.
+
+`Usage: python extract-fs-interface-data.py <job_stats_dir>`
+
+`<job_stats_dir>` is the directory containing all the CSV files generated by the `extract-job-stats.py` script.