Add Clock to Help

[quozl]

Clock has no documentation in help.sugarlabs.org, the Sugar embedded Help, or the Help activity.

• [x] write a source/clock.rst,
• [x] update source/index.rst,
• [x] update helplink.json,
• [x] make pull requests to https://github.com/godiard/help-activity

Information sources for writing;

• http://wiki.sugarlabs.org/go/Activities/Clock
• http://wiki.laptop.org/go/Clock_activity
• https://github.com/sugarlabs/clock-activity/blob/master/README.md

Lesson plan ideas;

• reading the time in different ways,
• speaking the time,
• ticking clocks, new feature in 6b4223d,
• on some systems, the download time button which uses NTP,
• combination of above.

[EmilyOng]

i would like to take this issue

[quozl]

Thanks!

[EmilyOng]

https://github.com/godiard/help-activity/pull/37

• [x] write a source/clock.rst,
• [x] update source/index.rst,
• [x] update helplink.json,
• [x] make pull requests to https://github.com/godiard/help-activity
• [x] added images

Lesson plans:

• [x] learning to count time
• [x] reading time in different ways
• [x] speaking time
• [x] learning about angles
• [x] finding the geographical north or south

[quozl]

Thanks.