Add link to documentation in README

README.md

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 # Cape API Client Module
-Python client library for the Cape API
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+Cape is an API from Bloomsbury AI that makes it easy to build software that answers questions about the contents of documents. For example, you can use cape to:
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+Build a super-powered ctrl+f that finds the answer to questions like ‘Who is the CFO?’, rather than just all the occurrences of a keyword.
+Build an expressive query tool for textual data - extract features with a single question.
+Build a virtual office assistant that answers routine questions through Slack.
+Build an add-on to your private search that mimics Google’s ‘direct answers’.
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+Read the full documentation at <http://cape-client.readthedocs.io/>