Update README.md

Author: Tahlor

README.md

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 # file_management
 Collection of scripts to help with managing files.
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+
+# Mirror File Times
+If you've already copied a folder over but want to modify file times, you can run this Python script to update the creation/modified/access times to mirror the original source.
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+Usage: `python mirror_file_times.py /src/dir /dest/dir`
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+Installation (Python 3.7+): `pip install pypiwin32 tqdm`
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+It should work on Linux, but I haven't tested it.
+