Add README with a short doc

README.md

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+Doctrine Types for Brazilian Documents
+==========================================
+
+[![Build Status](https://travis-ci.org/brazanation/php-documents-doctrine-types.svg?branch=master)](https://travis-ci.org/brazanation/php-documents-doctrine-types)
+[![StyleCI](https://styleci.io/repos/99854995/shield?branch=master)](https://styleci.io/repos/99854995)
+[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/brazanation/php-documents-doctrine-types/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/brazanation/php-documents-doctrine-types/?branch=master)
+[![Code Coverage](https://scrutinizer-ci.com/g/brazanation/php-documents-doctrine-types/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/brazanation/php-documents-doctrine-types/?branch=master)
+
+
+### Installation
+
+```sh
+composer require brazanation/document-doctrine-types dev-master
+```
+
+### How to Use?
+
+First of all, register the Document Types after Doctrine Connection.
+
+```php
+// bootstrap.php
+
+// ... other code
+$connection = \Doctrine\DBAL\DriverManager::getConnection($conn, $config, new \Doctrine\Common\EventManager());
+
+\Brazanation\Doctrine\TypeExtension::register($connection);
+
+// ... more code
+```
+
+Define the entity's property as the document
+
+```php
+/**
+ * @Entity @Table(name="persons")
+ */
+class Person
+{
+    /**
+     * @Id
+     * @Column(type="cpf")
+     * @var \Brazanation\Documents\Cpf
+     */
+    private $cpf;
+
+    /**
+     * Person constructor.
+     * @param \Brazanation\Documents\Cpf $cpf
+     */
+    public function __construct(\Brazanation\Documents\Cpf $cpf)
+    {
+        $this->cpf = $cpf;
+    }
+
+    /**
+     * @return \Brazanation\Documents\Cpf
+     */
+    public function getCpf()
+    {
+        return $this->cpf;
+    }
+}
+```
+
+### Available Types
+
+* CPF (Registration of individuals or Tax Identification)