added README and copyright nonsense

README.md

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+# csv-awk
+
+Copyright (C) 2025 Jonathan Lamothe <jonathan@jlamothe.net>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public
+License along with this program.  If not, see
+<https://www.gnu.org/licenses/>.
+
+## Executive Summary
+
+These are quick and dirty python scripts I threw together to
+facilitate manipulating CSV files with AWK.  It is heavily inspired by
+[csvquote](https://github.com/adamgordonbell/csvquote).  I just didn't
+want to have to install go on a machine to use it.  I wrote this one
+in Python because that's very likely to already be present on most any
+modern UNIX-ey system.
+
+It provides two scripts: `csv-reader.py` and `csv-writer.py` which
+read and write CSV files respectively.  Both read from standard input
+and write to standard output.  The format they convert the CSV to/from
+works as follows:
+
+- Each row is represented as a single line of text.
+- Cells are separated by tab characters.
+- Certain special characters within the cells are substituted for other values as follows:
+- Newlines become `~n`.
+  - Carriage returns become `~r`.
+  - Tabs become `~t`.
+  - Tildes (`~`) become `~!`.
+- All other characters remain unchanged.
+
+## Disclaimer
+
+I haven't seriously looked at Python in over a decade and I hacked it
+together in like 30 minutes.  Don't go looking for the most well
+put-together code you've ever seen.  It gets the job done though.