add a readme

README.md

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+# huppend
+
+huppend reads data on stdin and appends it to a specified file, `$outfile`.
+Additionally, it listens for SIGHUP.  When huppend receives SIGHUP, it closes
+its handle on `$outfile` and opens a new handle.  This is useful for log
+rotation.
+
+## usage
+
+`huppend --pidfile=huppend.pid outfile.log`