Update long_description in setup.py.twig

Author: chinmaychahar

templates/python/setup.py.twig

@@ -6,6 +6,8 @@ setuptools.setup(
   version = '{{sdk.version}}',
   license='{{spec.licenseName}}',
   description = '{{sdk.shortDescription}}',
+  long_description = '{{sdk.longDescription}}',
+  long_description_content_type = 'text/markdown',
   author = '{{spec.contactName}}',
   author_email = '{{spec.contactEmail}}',
   maintainer = '{{spec.contactName}}',