Need the ability to reset the counter

[rofrano]

As a User
I need the ability to reset the counter
So that I can start counting something new

Assumptions:

• We can zero the counter

Acceptance Criteria:

When I call 'POST /counter'
It returns the current counter value
When I call 'POST /counter/reset'
It returns zero (0) as the counter value
When I call 'POST /counter' after a `reset`
It returns a counter value of `1`