ENYO-2288: add moonstone checkbox item components on palette
ENYO-2288: add moonstone checkbox item components on palette

Modified moonstone.design file.

Change:
- Add two types checkbox components on ARES' palette as the discussion with Mr. Kevin.
- He requested that single checkbox & group checkbox should be added.

Benefit:
User can add checkbox easily for both cases that they want to add single checkbox button or group checkbox button.

Test Result:
It will be uploaded seperately on gitHub log message.

Note:
I have a suggestion. Actually many moonstone samples are mixed with various kinds.So, it is a little confused to add palette component on ARES.
Sometimes, need to decide how combined the mixture of kinds to provide useful palette component.
I think the judgement by me is not better. So I suggest that I add simple palette component very fast in first.
Then provide internal users or UX designer of ARES with new ARES. We'd better improve & add more complex UI components next time by gethering their feedbacks.

Please let me know if you have any other opinions.

Enyo-DCO-1.1-Signed-off-by: Sunggye <shiftpwr@gmail.com>

mcanthony/moonstone,enyojs/moonstone,mcanthony/moonstone,mcanthony/moonstone