add root-level README for the project

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+Text::Tradition - a Perl library for modelling textual variation
+===============================================================
+
+This repository contains the Text::Tradition library, developed as part of the [Tree of Texts](http://treeoftexts.arts.kuleuven.be/) project at the KU Leuven.  The library consists of a base distribution (in base/) and three add-on components:
+
+* analysis/ - Code for the representation and analysis of text stemmata.
+* morphology/ - Code for the representation of language and morphological information for a text.
+* persistence/ - Code for database storage and user access control for Tradition objects.
+
+The base, analysis, and persistence modules are also available on CPAN. The morphology module has dependencies upon several custom or custom-modified libraries, some of which are available in the [cpanmods](https://github.com/tla/cpanmods/) repository, and some of which is not (yet) publicly available. Please contact me if you wish to use it.
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