How to process resolved attributes and use them within some real-world examples.

[mbunge]

Add some examples to clarify the usage of resolved attributes.

First ideas:

• Use attributes with PSR-14 Event Dispatcher or PHP League Event

• Use attributes with PHP League route

• Use attributes with PHP League container

[mbunge]

Event driven approach added. See: https://github.com/mbunge/php-attributes/tree/master/examples/PhpLeagueEvent