Change the file noweb.py.txt to a Markdown README file.#1

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wware wants to merge 2 commits intoJonathanAquino:masterfrom

Commits on Mar 23, 2022

Switch from text to Markdown, from Py2 to Py3.
wware
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Commits on Apr 1, 2022

split out --executable as a separate option
wware
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