ChapterThree: Add list of ddd tools

Author: Codeliner

README.md

@@ -7,7 +7,7 @@ PHP version of the cargo sample used in Eric Evans Domain-Driven Design book
 [![Build Status](https://travis-ci.org/codeliner/php-ddd-cargo-sample.png?branch=master)](https://travis-ci.org/codeliner/php-ddd-cargo-sample)
 
 [> Installation](https://github.com/codeliner/php-ddd-cargo-sample/blob/master/docs/installation.md)
-
+[> DDD Tools and Libs](https://github.com/codeliner/php-ddd-cargo-sample/blob/master/docs/domain-driven-design-tools.md)
 Goal of the Project
 -------------------
 We want to show the PHP way of implementing Domain-Driven Design with the help of

docs/domain-driven-design-tools.md

@@ -0,0 +1,49 @@
+Domain-Driven Design Tools for PHP
+==================================
+
+We have listed a selection of useful tools and libraries that help you implementing Domain-Driven Design patterns.
+This list is not meant to be complete. It is just a choice of personal favorites.
+If you think we have missed an important tool, than please provide a pull request with your addition or simply open an [issue](https://github.com/codeliner/php-ddd-cargo-sample/issues).
+
+DDD Interfaces
+--------------
+
+###codeliner/shared-domain-set
+Collection of common DDD interfaces like EntityInterface, ValueObjectInterface, DomainEventInterface
+[GitHub Repository](https://github.com/codeliner/shared-domain-set)
+
+
+ValueObjects
+------------
+
+###nicolopignatelli/valueobjects
+A PHP 5.3+ library/collection of classes aimed to help developers with domain driven development and the use of immutable objects.
+[GitHub Repository](https://github.com/nicolopignatelli/valueobjects)
+
+
+Little Helper
+-------------
+
+###beberlei/assert
+A simple php library which contains assertions and guard methods for input validation. Useful to guard your domain objects.
+[GitHub Repository](https://github.com/beberlei/assert)
+
+###codeliner/php-equalsbuilder
+EqualsBuilder for PHP. Ease the comparison of ValueObject properties within ValueObjectInterface#sameValueAs implementations.
+See our [RoteSpecification#sameValueAs](https://github.com/codeliner/php-ddd-cargo-sample/blob/master/module/Application/src/Application/Domain/Model/Cargo/RouteSpecification.php) as an example.
+[GitHub Repository](https://github.com/codeliner/php-equalsbuilder)
+
+Storage
+-------
+
+###doctrine/doctrine2
+Doctrine 2 is an object-relational mapper (ORM) for PHP 5.3.2+ that provides transparent persistence for PHP objects. It fits well with DDD and helps you implement the repository pattern. See the various examples in our cargo shipping system.
+[GitHub Repository](https://github.com/doctrine/doctrine2)
+
+###doctrine/mongodb-odm
+The Doctrine MongoDB ODM project is a library that provides a PHP object mapping functionality for MongoDB. If you prefer using MongoDB as storage system, this library helps you implement the repository pattern like doctrine ORM do for Sql DBMS.
+[GitHub Repository](https://github.com/doctrine/mongodb-odm)
+
+###doctrine/couchdb-odm
+A Document Mapper based on CouchDB. If you prefer using CouchDB as storage system, this library helps you implement the repository pattern like doctrine ORM do for Sql DBMS.
+[GitHub Repository](https://github.com/doctrine/couchdb-odm)