Add Acceptance Tests Kata

[rodolfoprr]

Adding a Kata to practice Acceptance Tests going through the following steps:

1. Choosing website to be tested
2. Writing user stories
3. Writing tests
4. Testing in multiple browsers

For each item, I have put some examples of what can be used, but it's up to the group to decide what and how they are going to implement this Kata. If you know more tools or references to improve this Kata, please feel free to add.

@ReenaRajani @fabioelizandro @alabeduarte @ticidesign

[ReenaRajani]

Thanks :)