Add a brief README to the sansio

This should hopefully explain what it is used for and why certain code cannot be present in it.
pallets · Aug 19, 2023 · 3185925 · 3185925
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diff --git a/src/flask/sansio/README.md b/src/flask/sansio/README.md
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+# Sansio
+
+This folder contains code that can be used by alternative Flask
+implementations, for example Quart. The code therefore cannot do any
+IO, nor be part of a likely IO path. Finally this code cannot use the
+Flask globals.