Add Docker dev environment and initial code

tofu_api/app.py

@@ -0,0 +1,10 @@
+def app(environ, start_response):
+    """Simplest possible application object"""
+    data = b'Hello, wooorld!\n'
+    status = '200 OK'
+    response_headers = [
+        ('Content-type', 'text/plain'),
+        ('Content-Length', str(len(data)))
+    ]
+    start_response(status, response_headers)
+    return iter([data])