added readme

src/Notifications/README.md

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+## Mock of Altinn Notifications for localtest
+
+Repository: https://github.com/Altinn/altinn-notifications
+
+Things to be aware of when copying code: 
+
+- Persistence: code should not be copied directly, rather create a new implementation of the required repository class/method that writes data to disk.- Controllers: code should be copied, but changes might be required related to authorization (e.g., platform access token is not included in local requests)
+- Core: code can be copied directly without changes