Adding in a new message data model and the corresponding methods to in the API.

data/model/message.py

@@ -0,0 +1,12 @@
+from data.database import Message
+
+
+def get_messages():
+  messages = []
+  for message in Message.select():
+    messages.append({'id': message.id, 'content': message.content})
+  return messages
+
+def create(messages):
+  for message in messages:
+    Message.create(content=message['content'])