Mark a task as completed

[AdrianWaweru]

As a User
I need to be able to mark a task as completed
So that I can keep track of my progress.

Details and Assumptions

• We will use a Redis database
  -Counter will be stored as name value pair

Acceptance Criteria

Given that I am on the home page
When I click on the "View Completed Tasks" button
Then I should be able to see a list of all completed tasks
And the tasks should be sorted by the completion date