README libtiff

Change-Id: Icece0daad46896334cba7dc66435351a347bd2cb
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/134819
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
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libtiff is a library to encode and decode images in TIFF format, from [http://download.osgeo.org/libtiff/]

For the moment we use it only for decoding part.