add base class

[mmaelicke]

The Config class is the first of two base classes to handle configuration and data in a more flexible way. The Config is based on the collections.Mapping, which makes it iterable and similar to a dict. It is populated with default values, which are also accessible through class attributes, and can take an arbitrary amount of settings.

Example

from ruins import core

# create default config
conf = core.Config()

It is also possible to load a config form a JSON file. This will not necessarily be needed in this app, but might turn out helpful in future developments

conf = core.Config(path='/path/to/json')

For both cases existing configuration can be overwritten and any kwarg can be added.

conf = core.Config(debug=True, foo='bar')

print(conf.debug)   # True
print(conf['foo'])     # bar

This PR closes #11

[codecov]

Codecov Report

Merging #18 (8b8660c) into main (2e20f1a) will increase coverage by 7.92%.
The diff coverage is 96.87%.

@@           Coverage Diff            @@
##            main     #18      +/-   ##
========================================
+ Coverage   0.00%   7.92%   +7.92%     
========================================
  Files          3       4       +1     
  Lines        359     391      +32     
========================================
+ Hits           0      31      +31     
- Misses       359     360       +1     

Impacted Files	Coverage Δ
ruins/core/config.py	96.87% <96.87%> (ø)

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