Add shop.tac to be able to start zope with twisted.

shop.tac

@@ -0,0 +1,35 @@
+##############################################################################
+# Start zope with twisted WSGI server
+#
+# Install required python packages with pip:
+#
+#     ./venv/bin/pip install twisted plaster plaster_pastedeploy
+#
+# Start zope:
+#
+#     ./venv/bin/twistd -ny shop.tac
+##############################################################################
+
+from twisted.application import internet
+from twisted.application import service
+from twisted.internet import reactor
+from twisted.web.server import Site
+from twisted.web.wsgi import WSGIResource
+import os
+import plaster
+
+config='./instance/etc/zope.ini'
+config = os.path.abspath(config)
+port = 8081
+
+# Get the WSGI application
+loader = plaster.get_loader(config, protocols=['wsgi'])
+app = loader.get_wsgi_app('main')
+
+# Twisted WSGI server setup
+resource = WSGIResource(reactor, reactor.getThreadPool(), app)
+factory = Site(resource)
+
+# Twisted Application setup
+application = service.Application('zope')
+internet.TCPServer(port, factory).setServiceParent(application)