Add files for pypi release

Author: marcohenning

requirements.txt

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+QtPy>=2.4.1

setup.py

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+from setuptools import setup, find_namespace_packages
+
+
+with open('README.md', 'r') as fh:
+    readme = "\n" + fh.read()
+
+setup(
+    name='pyqt-loading-button',
+    version='1.0.0',
+    author='Marco Henning',
+    license='MIT',
+    packages=find_namespace_packages(where="src"),
+    package_dir={"": "src"},
+    install_requires=[
+        'QtPy>=2.4.1'
+    ],
+    python_requires='>=3.7',
+    description='A QPushButton with built-in loading animations for PyQt and PySide',
+    long_description=readme,
+    long_description_content_type='text/markdown',
+    url='https://github.com/marcohenning/pyqt-loading-button',
+    keywords=['python', 'pyqt', 'qt', 'button', 'animation'],
+    classifiers=[
+        'Programming Language :: Python :: 3',
+        'Operating System :: OS Independent',
+        'License :: OSI Approved :: MIT License'
+    ]
+)