add throttled-rate and user management docs

docs/Users.md

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+# User Management
+
+For now, **Tube Archivist** is a single user application. You can create multiple users with different names and passwords, but for now they will share the same interface. *More is on the roadmap*.
+
+## Admin Interface
+When logged from your *superuser* account, you are able to access the admin interface from the settings page or at `/admin/`. This interface holds all functionality for user management.
+
+## Superuser
+The first user gets created with the environment variables **TA_USERNAME** and **TA_PASSWORD** from your docker-compose file. That first user will automatically have *superuser* privileges. 
+
+## Create additional users
+From the admin interface when you click on *Accounts* you will get a list of all users. From there you can create additional users by clicking on *Add Account*, provide a name and confirm password and click on *Save* to create the user.
+
+## Changing users
+You can delete or change permissions and password of a user by clicking on the username from the *Accounts* list page and follow the interface from there. Changing the password of the *superuser* here will overwrite the password originally set with the environment variables.
+
+## Reset
+Delete all user configurations by deleting the file `cache/db.sqlite3` and restart the container. This will create the superuser again from the environment variables.
+
+NOTE: Future improvements here will most likely require such a reset.