DOC: adding classifiers and urls

setup.cfg

@@ -35,9 +35,22 @@ long_description = file: README.rst
 author = the PyVO Developers
 license = BSD
 license_file = LICENSE.rst
-url = https://github.com/astropy/pyvo
 edit_on_github = False
 github_project = astropy/pyvo
+project_urls =
+    Source = https://github.com/astropy/pyvo
+    Documentation = https:/pyvo.readthedocs.io
+classifiers =
+    Intended Audience :: Science/Research
+    License :: OSI Approved :: BSD License
+    Operating System :: OS Independent
+    Programming Language :: Python
+    Programming Language :: Python :: 3
+    Topic :: Database
+    Topic :: Scientific/Engineering :: Astronomy
+    Topic :: Software Development :: Libraries
+    License :: OSI Approved :: BSD License
+
 
 [options]
 packages = find: