Move package to src/ to properly separate what goes into docker image

src/setup.py

@@ -0,0 +1,17 @@
+from setuptools import setup, find_namespace_packages
+
+setup(
+    name="restic-compose-backup",
+    url="https://github.com/ZettaIO/restic-compose-backup",
+    version="0.3.0",
+    author="Einar Forselv",
+    author_email="eforselv@gmail.com",
+    packages=find_namespace_packages(include=['restic_compose_backup']),
+    install_requires=[
+        'docker==4.1.*',
+    ],
+    entry_points={'console_scripts': [
+        'restic-compose-backup = restic_compose_backup.cli:main',
+        'rcb = restic_compose_backup.cli:main',
+    ]},
+)