Setup dependencies, tox, dummy test

setup.py

@@ -71,11 +71,10 @@ setup(
     ],
     python_requires='>=3.6',
     install_requires=[
-        # eg: 'aspectlib==1.1.1', 'six>=1.7',
+        'cryptography'
     ],
     extras_require={
-        # eg:
-        #   'rst': ['docutils>=0.11'],
-        #   ':python_version=="2.6"': ['argparse'],
+        'django': ['django>=3.2'],
+        'sqlalchemy': ['sqlalchemy>=1.4']
     },
 )