Added the FraCaS Treebank to the examples

examples/fracas/README.txt

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+======================
+The FraCaS GF Treebank
+======================
+
+:Author: Peter Ljunglöf
+:Version: 0.2
+:Date: 2012-01-27
+:Organization: Centre for Language Technology, University of Gothenburg
+:Copyright: Distributed under GNU GPL v3, see COPYING.txt for details
+
+1. Introduction
+===============
+
+This is the FraCaS Treebank, developed and maintained by 
+the Centre for Language Technolgy at University of Gothenburg:
+
+    http://www.clt.gu.se/
+
+The treebank is part of the CLT Toolkit, a set of state-of-the-art
+open source Language Technology tools and accompanying linguistic
+resources.  The different parts of the toolkit, including the 
+FraCaS Treebank, can be downloaded from:
+
+    http://www.clt.gu.se/clt-toolkit
+
+The treebank is built upon the FraCaS textual inference problem set, 
+which was built in the mid 1990’s by the FraCaS project, a large
+collaboration aimed at developing resources and theories for
+computational semantics.  This test set was later modified and
+converted to XML by Bill MacCartney:
+
+    http://www-nlp.stanford.edu/~wcmac/downloads/fracas.xml
+
+It is this modified version that has been used in this treebank. 
+The corpus consists of 346 problems each containing one or more
+statements and one yes/no-question (except for four problems, where
+there is no question).  The total number of sentences in the corpus is
+1220, but since some of them are repeated in several problems, there
+are in total 874 unique sentences. 
+
+2. Description
+==============
+
+The treebank is created in Grammatical Framework (GF), using its
+multilingual Resource Grammar as backend grammar.  Currently the
+treebank is bilingual, with an English and a Swedish lexicon. 
+
+More information about GF, including installation instructions, 
+can be found at: 
+
+    http://www.grammaticalframework.org/
+
+The treebank is also distributed in XML and Prolog formats, 
+for people that have no interest in learning GF.  Note however 
+that the syntactical constructions come from the GF resource grammar. 
+
+3. Download and installation
+============================
+
+The full distribution can be downloaded from
+`<dist/FraCaSBank-0.2.zip>`_.
+
+The Prolog and XML treebanks are already generated, so to use these
+you don't need anything else. But if you want to work with the GF
+source files, you need a GF installation including the Resource Grammar. 
+
+4. Contents
+===========
+
+a) Documentation
+----------------
+
+The documentation is located in the `doc directory <doc>`_:
+
+``FraCaSBank-report.{pdf,lyx,bib}``:
+  A technical report describing the treebank, together with
+  the `LyX <http://www.lyx.org>`_ and 
+  `BibTeX <http://www.bibtex.org>`_ source files.
+  The PDF version can be `read here <doc/FraCaSBank-report.pdf>`_.
+
+b) GF source files
+------------------
+
+The grammar sources are located in the `src directory <src>`_:
+
+``Additions*.gf``
+  Generic additions to the GF Resource Grammar.
+
+``FraCaS*.gf``
+  Grammatical constructions specific to the FraCaS domain.
+
+``FraCaSLex*.gf``
+  The lexical items in the FraCaS treebank.
+
+``FraCaSBank*.gf``
+  The actual treebank. 
+  The file ``FraCaSBankOriginal.gf`` contains the original treebank sentences.
+  The file ``FraCaSBankI.gf`` contains the language-independent abstract syntax trees.
+
+c) Other files
+--------------
+
+``Makefile, build_fracasbank.py``
+  Files for automatically generating the XML and Prolog treebank.
+
+``build/FraCaSBank.{xml,pl}``
+  The automatically generated 
+  `XML treebank <build/FraCaSBank.xml>`_ and 
+  `Prolog treebank <build/FraCaSBank.pl>`_.
+
+``dist/FraCaSBank*.zip``
+  All files collected in a zip file.
+
+``README.txt, COPYING.txt``:
+  The `source <README.txt>`_ of this README file, and `GNU GPL 3 <COPYING.txt>`_ licensing information.