Provide initial documentation

Author: weierophinney

docs/book/index.html

@@ -0,0 +1,10 @@
+<div class="container">
+    <div class="jumbotron">
+        <h1>zend-config-aggregator-modulemanager</h1>
+
+        <p>Consume zend-mvc modules as configuration providers within
+          zend-config-aggregator.</p>
+
+        <pre><code class="language-bash">$ composer require zendframework/zend-config-aggregator-modulemanager</code></pre>
+    </div>
+</div>

docs/book/usage.md

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+# Usage
+
+This package ships with a [zend-config-aggregator provider](https://docs.zendframework.com/zend-config-aggregator/config-providers/)
+that allows you to use `Module` classes as configuration providers in
+applications backed by `Zend\ConfigAggregator\ConfigAggregator`.
+
+As an example, consider the following `Module` class:
+
+```php
+namespace My\Zend\MvcModule;
+
+class Module 
+{
+    public function getConfig()
+    {
+        return [
+            'service_manager' => [
+                'invokables' => [
+                    Service\MyService::class => Service\MyService::class, 
+                ],
+            ],
+        ];
+    }
+}
+```
+
+When defining configuration for your application, you can use the class
+`Zend\ConfigAggregatorModuleManager\ZendModuleProvider` to wrap the module and
+use it as a configuration provider:
+
+```php
+use Zend\ConfigAggregator\ConfigAggregator;
+use Zend\ConfigAggregatorModuleManager\ZendModuleProvider;
+use My\Zend\MvcModule\Module as MyZendMvcModule;
+
+$aggregator = new ConfigAggregator([
+    new ZendModuleProvider(new MyZendMvcModule()),
+]);
+
+var_dump($aggregator->getMergedConfig());
+```
+
+Using this provider, the `Module` class is being parsed for
+`zendframework/zend-modulemanager` interfaces or methods in exactly the same way as
+performed in zend-mvc applications.
+
+The resultant output of the above example would be:
+
+```php
+array(1) {
+  'dependencies' => 
+  array(1) {
+    'invokables' =>
+    array(1) {
+       'My\Zend\MvcModule\Service\MyService' =>
+       string(35) "My\Zend\MvcModule\Service\MyService"
+    }
+  }
+}
+```

mkdocs.yml

@@ -3,6 +3,7 @@ docs_dir: docs/book
 site_dir: docs/html
 pages:
     - index.md
-site_description: 'zendframework/zend-modulemanager extension for the zendframework/zend-config-aggregator package.'
+    - Usage: usage.md
+site_description: 'Consume zend-mvc modules as configuration providers within zend-config-aggregator.'
 repo_url: 'https://github.com/zendframework/zend-config-aggregator-modulemanager'
-copyright: 'Copyright (c) 2016-2018 <a href="http://www.zend.com/">Zend Technologies USA Inc.</a>'
+copyright: 'Copyright (c) 2018 <a href="http://www.zend.com/">Zend Technologies USA Inc.</a>'