add settings files for production environment

add settings_production to override certain development settings
add settings_secrets.py.sample to illustrate usage of production secrets

.gitignore

 # AKPlanning .gitignore
 # Custom
 
+# Secrets for production
+AKPlanning/settings_secrets.py
 
 # Created by https://www.gitignore.io/api/python,django,virtualenv,pycharm+all
 # Edit at https://www.gitignore.io/?templates=python,django,virtualenv,pycharm+all

AKPlanning/settings_production.py

+"""
+This is the settings file used in production.
+First, it imports all default settings, then overrides respective ones.
+Secrets are stored in and imported from an additional file, not set under version control.
+"""
+
+from AKPlanning.settings import *
+import AKPlanning.settings_secrets as secrets
+
+
+### SECURITY ###
+
+DEBUG = False
+
+ALLOWED_HOSTS = secrets.HOSTS
+
+SECRET_KEY = secrets.SECRET_KEY
+
+# TODO: DB, chaching, CSRF etc.

AKPlanning/settings_secrets.py.sample

+SECRET_KEY = ''
+
+HOSTS = []