datahub-client complete documentation

[AcckiyGerman]

As a programmer I want to have a full documented lib so I can communicate with the DataHub easily.

Acceptance criteria

• [x] README.md file in the http://github.com/datahq/datahub-client describes exported methods with the examples.

Tasks

• [x] read https://github.com/datahq/data.js README.md file as an example
• [x] write the documentation file
• [x] update https://datahub.io/docs/tutorials/js-sdk-tutorial
  • had the description of how to push and get data, and a link to the full doc.

issues

https://github.com/datahq/pm/issues/136

[AcckiyGerman]

FIXED:

• https://github.com/datahq/datahub-client/blob/master/README.md
• https://datahub.io/docs/tutorials/js-sdk-tutorial