Add README

Author: booniepepper

README.md

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+# `findup`
+
+```text
+Usage: findup FILE
+
+Finds a directory containing FILE. Starts at the current working directory, and
+searches "up" through each parent directory.
+
+When a directory is found, it is printed to stdout.
+
+If no directory containing FILE is found, nothing is printed, and the
+program exits with an exit code of 1.
+
+By: J.R. Hill <hiljusti@pm.me>
+```
+