Running compute job with user defined parameters

[akshay-ap]

Fixes #947 , #1114

Changes proposed in this PR:

• [x] Explain c2d parameters
• [x] Add example to publish dataset and algo that can support user defined inputs
• [x] Add python script to start the compute job

AFAIK, ocean.js doesn't support algo params and user defined params for c2d jobs to not including javascript code snippet.

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