Walk-through guide structure

[codeliner]

First ideas for a walk-through guide:

1. |_ Beginner Tutorial |_ prooph/common - working with immutable messages |_ CQRS - divide and conquer |_ EventSourcing - Code with intent
2. |_ Basic Concepts |_ Event sourced models |_ Persist events in an event store |_ Handle commands |_ Use projections |_ Query state |_ Inter-process communication using events
3. |_ Advanced Concepts |_ Snapshots |_ Event Store HTTP api |_ ....
4. |_ Framework integration |_ zend-expressive |_ Symfony |_ Laravel |_ ....

[sandrokeil]

Looks good :+1:

[codeliner]

Reminder for myself: link to blogpost: https://github.com/Ocramius/ocramius.github.com/issues/103