TF-2877 Create ADR for notification setting decision

docs/adr/0048-notification-setting.md

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+# 48. Notification setting
+
+Date: 2024-06-04
+
+## Status
+
+Accepted
+
+## Context
+
+- User need a way to tell and change notification configuration in-app
+- However, no app is allowed directly change the device's settings by design
+- With Gmail, Google will redirect users to system settings if they desire to change it
+
+## Decision
+Twake Mail will follow the method Google made for Gmail
+
+## Consequences
+The permission's status will always reflect system's configuration, and the system's configuration will be the single source of truth.