Added method for downloading reports in PDF, added packaging tools.

setup.py

@@ -0,0 +1,19 @@
+from setuptools import setup, find_packages
+
+setup(
+    name="kontur_focus",
+    version="0.1.0",
+    author="Ilya Sapunov",
+    author_email="sapunov@selectel.ru",
+    description="Библиотека-обертка для взаимодействия с REST API Контур.Фокус",
+    url="https://git.selectel.org/is/public/kontur-focus-lib",
+    license="MIT",
+    packages=find_packages(),
+    install_requires=["requests", "python-dotenv"],
+    classifiers=[
+        "Programming Language :: Python :: 3",
+        "License :: OSI Approved :: MIT License",
+        "Operating System :: OS Independent",
+    ],
+    python_requires='>=3.9',
+)