added chapter map to README

17-it-generator/isis2json/README.rst

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+isis2json.py
+============
+
+This directory contains a copy of the ``isis2json.py`` script, with
+minimal dependencies, just to allow the O'Reilly Atlas toolchain to
+render the listing of the script in appendix A of the book.
+
+If you want to use or contribute to this script, please get the full
+source code with all dependencies from the main ``isis2json``
+repository:
+
+https://github.com/fluentpython/isis2json