Added chapters and list of exercises

CH_10_testing_and_logging/README.rst

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+Chapter 10 - testing and logging
+=======================================================================================================================
+
+1. Create a function that tests the doctests of a given function/class.
+2. For a greater challenge, create a function that recursively tests all doctests of every function and class in a given module.
+3. Create a `py.test` plugin that checks if all tested files have file-level documentation. Hint: use `pytest_collect_file`.
+4. Create a custom `tox` environment to run `flake8` or `mypy` on your project.
+5. Create a `LoggerAdapter` that combines multiple messages into a single message based on some task ID.