Add new icons

[davidhunter08]

Adding new icons:

• calendar
• clock
• download
• email
• filter
• letter
• night
• phone call
• sort

[davidhunter08]

calendar icon name should probably be add-calendar?

[davidhunter08]

@edwardscull how do you think we should handle the colour of the icons?

All previous icons have been blue but some of the new icons (clock, night and phone call) need to be black.

Example:

[edwardscull]

@edwardscull how do you think we should handle the colour of the icons?

All previous icons have been blue but some of the new icons (clock, night and phone call) need to be black.

Example:

Have we confirmed whether we need to support both blue and black?

[davidhunter08]

@edwardscull how do you think we should handle the colour of the icons?
All previous icons have been blue but some of the new icons (clock, night and phone call) need to be black.
Example:

Have we confirmed whether we need to support both blue and black?

Yes. I've added a modifier class nhsapp-icon-black.