Added notification.feature

features/notifications.feature

+@javascript
+Feature: Notifications
+  In order to see what is happening
+  As a User
+  I want to get notifications
+
+Scenario: someone offers to share with me
+  Given I am signed in
+  And I have one contact request
+  And I follow "notifications" in the header
+  Then I should see "offered to share with you"
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