Config file and class

[vkbo]

Summary:

Ports over the initialisation of logging and the main Config class from the dmci repo and adapts the code for the current package. Tests are also copied over.

Related Issue:

Closes #9

Reviewer checklist:

• [x] The headers of all files contain a reference to the repository license
• [x] 100% test coverage of new code
• [x] All tests are passing
• [x] All names (e.g., files, classes, functions, variables) are explicit
• [x] Documentation (as docstrings) is complete and understandable

[vkbo]

There is no need to review draft pull requests.

[vkbo]

Please stop reviewing before the PR is complete. It is a waste of your time and mine.