Add notifications README to trigger full test suite

Author: steventux

manage_breast_screening/notifications/README.md

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+# Manage Breast Screening Notifications
+
+## Notifications App
+
+Notifications is a Django application responsible for sending notifications to clients of the wider Manage Breast Screening project.
+
+The application is composed of a set of Django Admin commands which are run on a schedule.
+The commands currently process a feed of data from the active NBSS system and store and send appointment notifications based on this feed.