Helps diagnose empty instance and operation name errors.

Adds a link to Bazel in addition to BuildStream as a client.
Amends some of the formatting of paragraphs so they are in a more logical order.

Adds links as hyperlinks so that the README page looks neater

Amends links to be hyperlinks so that the webpages look neater.

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#51

If no service exists, creates the object.

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