In-app notifications

### Title: In-app notifications

----

## Description:
* As a user
* I want in-app notifications that complement email notifications
* so that I know when I need to take an action or something is new

**Acceptance Criteria**
* GIVEN a user has notifications (question - do they have to receive an email?)
* WHEN the user is logged in
* THEN the user will see a bell with a red dot
* WHEN the user clicks on the bell
* THEN the user will see a list of notifications ordered by most recent at the top

**Dependencies? (If so, link dependency in the ticket, make it visible in a team´s backlog)**

**Validation Rules? (If yes, list here)**

----

**DoR for User Story:**
- [ ] Do we have a prioritized Sprint Backlog?
- [ ] Defects, user stories and other work the team has committed to are contained in the sprint backlog?
- [ ] Any hidden work?
- [ ] All team members availability (days) & capacity (in SP) is known for the Sprint?
- [ ] All users stories meet the DoR?

**Definition of Ready:**
1. [ ] Does User Story have full flow of business rules, happy and alternate paths, etc.?
2. [ ] Requirements & expected behavior included in the User Story?
3. [ ] Are the dependencies known/ understood?
4. [ ] Dev team accepts user experience artifacts
5. [ ] If there are validation rules, are they defined (UI, Data, Role-Action)?
6. [ ] Does this User Story needs stakeholder approval?
7. [ ] Is this user story small enough to be completed in a Sprint?
8. [ ] What do we possible have to do re Change Management? - a) GCPE, …?

----

**Definition of Done:**
1) [ ] Check Requirements against completed tasks
2) [ ] Completed stories verified in Dev and Test
3) [ ] Confirm Test cases built and succeeding
4) [ ] No regression test failures
5) [ ] Test coverage acceptable by Product Owner???
6) [ ] Ticket merged to master or story branch
7) [ ] Developer to list Config changes/ Update documents and designs
8) [ ] Design / Solution accepted by Product Owner
9) [ ] UX Approved
10) [ ] Can be demoed in Sprint Review
11) [ ] Release ticket is created and this US is linked to it