Doco updated

docs/tests.rst

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 Library Tests
 =============
 
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 Courtesy of Vincent Hamp, the |EX-NCL| has unit tests that can be run locally as well automatically being run as a GitHub action when pushing to the main branch (see tests.yml in the repository).
 
 These tests are written using GoogleTest which allows for mocking as well as testing.
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 For Ubuntu, install the required packages with:
 
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   sudo apt install build-essential doxygen cmake graphviz
 
 Once these packages are installed, running the tests is pretty simple:
 
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   cd <directory>/DCCEXProtocol
   cmake -Bbuild