Merge pull request #27 from ltalirz/fix-readme

update readme

README.md

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 # aiida-testing
 
 A pytest plugin to simplify testing of AiiDA plugins. This package implements two ways of running an AiiDA calculation in tests:
 - `mock_code`: Implements a caching layer at the level of the executable called by an AiiDA calculation. This tests the input generation and output parsing, which is useful when testing calculation and parser plugins.
 - `export_cache`: Implements an automatic export / import of the AiiDA database, to enable AiiDA - level caching in tests. This circumvents the input generation / output parsing, making it suitable for testing higher-level workflows. 
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+For more information, see the [documentation](http://aiida-testing.readthedocs.io/).