Adding design documentation

DESIGN.md

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+# Overall Design
+
+## User Journey
+On first login, the user will be informed that the website is intended for
+adults and the dangers of starvation play. Once they have gone through the
+acknowledgment, they will be shown the "logged out" mode for game, where there
+is no cooldown for asking for meals. This is intended to be a testing
+environment both for development as well as for users to understand how the game
+works.
+
+## User safety considerations
+To prevent refeeding syndrome, the game will not allow users to set the maximum
+fast duration over 3 days, and will be significantly more likely to allow food
+after 1 day. This makes sure that refeeding syndrome risks are minimized ([This
+article](https://www.verywellhealth.com/refeeding-syndrome-8720457) indicates
+that 5 days in when risks start to become noticeable).

PAGES.md

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+# Page Structure
+
+## `/`
+Main page, will show the testing version for logged out users and the normal
+version for logged in users. Alias for `/test` for logged out users and `/play`
+for logged in ones.
+
+## `/about`
+A description of the game, safety considerations, and a link to the repository.
+
+## `/user`
+Configuration page for the user. This is where custom meals, as well as setting
+the max fast duration (up to 3 days, defaulting to 1 day) can be set. Will
+redirect to the login page for logged out users.
+
+## `/test`
+Testing area for the game. Will be the equivalent to what logged out users will
+see, and will be a hidden url for logged in users.
+
+## `/play`
+Hosts the main game. For logged in users, this is the same as `/`. For logged
+out users, this will redirect to the login page.
+
+## `/login`
+Basic login page. Allows for logged out users to log in, and will ask a logged
+in user if they would like to switch accounts (log out).