Update descriptions in Python bindings setup.py

src/runtime/python/setup.py

@@ -17,7 +17,13 @@
 
 setup (name = 'pgf',
        version = '1.0',
-       description = 'A binding to the PGF engine',
+       description = 'Python bindings to the Grammatical Framework\'s PGF runtime',
+       long_description="""\
+Grammatical Framework (GF) is a programming language for multilingual grammar applications.
+This package provides Python bindings to GF runtime, which allows you to \
+parse and generate text using GF grammars compiled into the PGF format.
+""",
+       url='https://www.grammaticalframework.org/',
        author='Krasimir Angelov',
        author_email='[email protected]',
        license='BSD',