Mini cart

[oliverheywood451]

Description

Displays cart contents when you hover on cart icon in the app header.

For Reference #29

Type of change

• [ x] New feature (non-breaking change which adds functionality)

Checklist:

• [x ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x ] I have added tests that prove my fix is effective or that my feature works
• [x ] New and existing unit tests pass locally with my changes
• [ ] I have updated the acceptance criteria on the task so that it can be tested
• [x ] I have verified my contribution works and looks well in Firefox, Safari and Internet Explorer