Create Requirements.md

Requirements.md

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+# Requirements
+
+The requirements are written in the Given When Then format. This is a common format used
+for acceptance criteria & tests. The requirements are written in a way that is not specific to any
+particular technology. This allows us to write the tests first and then implement the
+functionality to make the tests pass.
+
+Writing Acceptance Tests will be out of the scope of this exercise. However, the requirements
+can still guide our Integration & Unit Tests.
+
+```
+Given there is no account for user A
+When user A creates an account
+Then the account is persisted
+And a calendar is created
+```
+
+```
+Given there is an account for user A
+When user A deletes their account
+Then the account is not active
+And the calendar is not active
+```
+
+```
+Given there is an account for user A
+And there is a calendar for user A
+When a user creates an appointment in the calendar for user A
+Then the appointment can be viewed
+```
+
+```
+Given there is an account for user A
+And there is a calendar for user A
+When a user creates an appointment in the calendar for user A
+Then the appointment can be viewed
+```
+
+```
+Given there is an account for user A
+And there is a calendar for user A
+And there is an appointment Z
+When a user updates appointment Z
+Then the updated appointment is persisted
+```
+
+```
+Given there is an account for user A
+And there is a calendar for user A
+And there is an appointment Z
+When a user deletes appointment Z
+Then appointment Z is not active
+```
+
+```
+Given there is an account for user A
+And there is a calendar for user A
+And there is an appointment Z at 11am
+When a user creates another appointment X at 11am
+Then appointment X is also persisted
+```
+
+```
+Given there is an account for user A
+And there is a calendar for user A
+And there is an appointment Z at 11am
+And there is an appointment X at 11am
+When a user gets all appointments
+Then all appoints can be viewed
+And the conflicting appointments can also be viewed
+```