[docs] [issue8910] Write a text file explaining why Lib/test/data exists

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

By the way, is this file picked up by Tools/msi/msi.py?

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nosy: +loewis
versions:  -Python 2.6, Python 2.7, Python 3.1

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