share: intro a README file to explain the sub-folders

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/share/README b/share/README
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+# Nit share folder
+
+This folder provides external projects and additionnal data needed by the Nit project.
+
+## png
+
+The png library is used to compile mnit clients for the Android platform.
+The folder contains the whole projet at version 1.6.9. It is configured and
+additionnal Android makefiles are added.