Add the usual project files in order to build a tarball more easily

MANIFEST.in

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+include *.py
+include *.md
+include COPYING
+include LICENSE
+recursive-include templates *
+recursive-include ivatar *
+exclude .virtualenv
+exclude libravatar.egg-info
+global-exclude *.py[co]
+global-exclude __pycache__

pyproject.toml

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+[build-system]
+requires = ['setuptools>=40.8.0', 'wheel']
+build-backend = 'setuptools.build_meta:__legacy__'

setup.cfg

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+[metadata]
+name = libravatar
+version = 1.7.0
+description = A Django application implementing libravatar.org
+long_description = file: README.md
+url = https://libravatar.org
+author = Oliver Falk
+author_email = oliver@linux-kernel.at
+license = GPLv3
+classifiers =
+    Environment :: Web Environment
+    Framework :: Django
+    Framework :: Django :: 3.2
+    Framework :: Django :: 4.0
+    Framework :: Django :: 4.1
+    License :: OSI Approved :: GNU General Public License v3 (GPLv3)
+    Operating System :: OS Independent
+    Programming Language :: Python
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
+    Topic :: Internet :: WWW/HTTP
+    Topic :: Internet :: WWW/HTTP :: Dynamic Content
+
+[options]
+include_package_data = true
+packages = find:
+python_requires = >=3.8
+install_requires =
+    Django >= 3.2

setup.py

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+# -*- coding: utf-8 -*-
+from setuptools import setup, find_packages
+
+setup(
+    packages=find_packages(),
+)