Add a test suite and some basic navigation

setup.cfg

@@ -0,0 +1,43 @@
+[metadata]
+name = babi
+version = 0.0.0
+description = a text editor
+long_description = file: README.md
+long_description_content_type = text/markdown
+url = https://github.com/asottile/babi
+author = Anthony Sottile
+author_email = asottile@umich.edu
+license = MIT
+license_file = LICENSE
+classifiers =
+    License :: OSI Approved :: MIT License
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: Implementation :: CPython
+    Programming Language :: Python :: Implementation :: PyPy
+
+[options]
+py_modules = babi
+python_requires = >=3.6
+
+[options.entry_points]
+console_scripts =
+    babi = babi:main
+
+[bdist_wheel]
+universal = True
+
+[mypy]
+check_untyped_defs = true
+disallow_any_generics = true
+disallow_incomplete_defs = true
+disallow_untyped_defs = true
+no_implicit_optional = true
+
+[mypy-testing.*]
+disallow_untyped_defs = false
+
+[mypy-tests.*]
+disallow_untyped_defs = false