add notification concept

docs/notifications.md

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+- different options in terms of complexity:
+    - special notification settings for each combination of
+        - meeting
+        - athlete
+        - team
+    - only default settings
+    - some settings for different notification types
+        - files
+        - favorites
+        - team mates
+        - myself
+    - settings for time of notification → 15 min before start?
+
+# Notify about…
+
+- free text
+
+## Before Meeting
+
+- ~~new files → prob only interesting for start list? other publications?~~
+- start list available/published → to find own starts and add favourites
+- meeting upcoming reminder → to remember that SwimResults exists for this meeting (only when subscribed)
+- new meeting with your athlete → remember user that app exists (only if not subscribed but meeting with his athlete, instead of two previous ones?)
+
+## During Meeting
+
+- live stream info → maybe as part of start notification (meeting has been started on time, see live timing and stream)
+- me → be informed about my own start
+    - upcoming start → reminder to not miss a start
+    - new result published → to know places as fast as possible
+    - new start imported → final qualification, changes in the start list
+- favourites
+    - upcoming start → don’t miss your friend’s/child’s/favourite’s starts
+    - new result published → to know places as fast as possible, really necessary?
+    - ~~swimming right now? → live link + stream → upcoming start is enough~~
+    - new start imported → final qualification, changes in the start list
+- team mates
+    - ~~upcoming start → too much~~
+    - ~~new result published → too much~~
+    - ~~swimming right now? → live link + stream~~
+    - new start imported → final qualification (only finals!)
+- schedule
+    - next start delayed → to know if you have more break time
+    - next start early → to not miss starts
+    - changes/updates (break shortened, etc.) → to know about changed breaks/warmup times
+
+## After Meeting
+
+- results and results file published → to receive final results without checking all the time
+
+# Notification Settings
+
+configure which…
+
+Athlete Notifications
+
+Favourites Notifications
+
+Schedule Notifications
+
+Meeting Notifications
+
+… you want to receive
+
+# Notification Service vs. User Service
+
+| Notification Service | Notifications in User Service |
+| --- | --- |
+| not affected by user service availability | no new micro service |
+|  | no inter-service relations since notifications are user-related |
+|  | less server resources needed |
+|  | user settings and notification settings in one place |
+|  | closer relation to subscriptions |
+
+# SwimResults User ↔ Notification User
+
+- Notifications are pay feature
+- with SwimResults PLUS or SwimResults PRO user has notifications
+- for both an account is required
+- notifications per account
+- no notification user without account?
+- but what about general notifications for everyone?! → notification identifier required
+- what about multiple devices of the same user?
+- maybe subscription not related to account?!
+- app only with account?
+
+# Questions to clarify
+
+## How prevent multiple notifications for the same reason?
+
+## Should subscriptions always be related to a user account?
+
+## How to handle multiple devices of the same user?
+
+## Are there notifications without subscription?