Adding documentation reference in help()

[marcospb19]

Should fix #13

help(cson) now shows link to the source repository where documentation is available

[coveralls]

Pull Request Test Coverage Report for Build 26

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 94.621%

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Totals
Change from base Build 25:	0.0%
Covered Lines:	387
Relevant Lines:	409

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💛 - Coveralls

[marcospb19]

Description field added:

[avakar]

Awesome, thank you!