Add minimal packaging setup

So that nxdtest could be installed as egg via pip or buildout.

setup.py

+# nxdtest | pythonic package setup
+from setuptools import setup
+
+setup(
+    name        = 'nxdtest',
+    version     = '0.0.0.dev1',
+    description = 'Tox-like tool to run tests for a project under Nexedi testing infrastructure',
+    url         = 'https://lab.nexedi.com/kirr/nxdtest',
+    license     = 'GPLv3+ with wide exception for Open-Source',
+    author      = 'Nexedi',
+    author_email= 'kirr@nexedi.com',
+
+    keywords    = 'Nexedi testing infrastructure tool tox',
+
+    packages    = [],
+    install_requires = ['erp5.util'],
+
+    scripts     = ['nxdtest'],
+
+    classifiers = [_.strip() for _ in """\
+        Development Status :: 3 - Alpha
+        Intended Audience :: Developers
+        Topic :: Utilities\
+    """.splitlines()]
+)