Dhii/config-interface

# Dhii - Config - Interface

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## Details
[PSR-11][]-compatible interfaces for working with structured configuration.

### Interfaces
- [`ConfigInterface`][ConfigInterface] - The main interface. On top of [`ContainerInterface`][ContainerInterface],
it adds the concept of "path", allowing access to nested data.
- [`ConfigAwareInterface`][ConfigAwareInterface] - Awareness of a config.
- [`ConfigFactoryInterface`][ConfigFactoryInterface] - Creates config instances.


[Dhii]:                                     https://github.com/Dhii/dhii
[PSR-11]:                                   https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-11-container.md

[ConfigInterface]:                          src/ConfigInterface.php
[ConfigFactoryInterface]:                   src/ConfigFactoryInterface.php
[ConfigAwareInterface]:                     src/ConfigAwareInterface.php

[ContainerInterface]:                       https://github.com/php-fig/container/blob/master/src/ContainerInterface.php