Update documentation / example

Thanks to @llaville for pointing this out

README.md

@@ -12,8 +12,9 @@ If you only need this library during development, for instance to run your proje
 
     composer require --dev phar-io/manifest
 
-## Usage
+## Usage Examples
 
+### Read from `manifest.xml`
 ```php
 use PharIo\Manifest\ManifestLoader;
 use PharIo\Manifest\ManifestSerializer;
@@ -24,3 +25,30 @@ var_dump($manifest);
 
 echo (new ManifestSerializer)->serializeToString($manifest);
 ```
+
+### Create via API
+```php
+$bundled = new \PharIo\Manifest\BundledComponentCollection();
+$bundled->add(
+    new \PharIo\Manifest\BundledComponent('vendor/packageA', new \PharIo\Version\Version('1.2.3-dev')
+    )
+);
+
+$manifest = new PharIo\Manifest\Manifest(
+    new \PharIo\Manifest\ApplicationName('vendor/package'),
+    new \PharIo\Version\Version('1.0.0'),
+    new \PharIo\Manifest\Library(),
+    new \PharIo\Manifest\CopyrightInformation(
+        new \PharIo\Manifest\AuthorCollection(),
+        new \PharIo\Manifest\License(
+            'BSD-3-Clause',
+            new \PharIo\Manifest\Url('https://spdx.org/licenses/BSD-3-Clause.html')
+        )
+    ),
+    new \PharIo\Manifest\RequirementCollection(),
+    $bundled
+);
+
+echo (new ManifestSerializer)->serializeToString($manifest);
+```
+

examples/example-01.php

@@ -20,4 +20,5 @@
     $manifest->getName()->asString(),
     $manifest->getVersion()->getVersionString()
 );
+
 echo (new ManifestSerializer)->serializeToString($manifest);

examples/example-02.php

@@ -0,0 +1,50 @@
+<?php declare(strict_types = 1);
+/**
+ * Thanks to @llaville for this example
+ */
+use PharIo\Manifest\ManifestSerializer;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+$bundledComponentCollection = new \PharIo\Manifest\BundledComponentCollection();
+$bundledComponentCollection->add(
+    new \PharIo\Manifest\BundledComponent(
+        'vendor/packageA',
+        new \PharIo\Version\Version('0.0.0-dev')
+    )
+);
+
+$manifest = new PharIo\Manifest\Manifest(
+    new \PharIo\Manifest\ApplicationName('vendor/package'),
+    new \PharIo\Version\Version('1.0.0'),
+    new \PharIo\Manifest\Library(),
+    new \PharIo\Manifest\CopyrightInformation(
+        new \PharIo\Manifest\AuthorCollection(),
+        new \PharIo\Manifest\License(
+            'BSD-3-Clause',
+            new \PharIo\Manifest\Url('https://spdx.org/licenses/BSD-3-Clause.html')
+        )
+    ),
+    new \PharIo\Manifest\RequirementCollection(),
+    $bundledComponentCollection
+);
+
+echo (new ManifestSerializer)->serializeToString($manifest);
+
+/*
+ * Output produced
+ *
+<?xml version="1.0" encoding="UTF-8"?>
+<phar xmlns="https://phar.io/xml/manifest/1.0">
+    <contains name="vendor/package" version="1.0.0" type="library"/>
+    <copyright>
+        <license type="BSD-3-Clause" url="https://spdx.org/licenses/BSD-3-Clause.html"/>
+    </copyright>
+    <requires>
+        <php version="*"/>
+    </requires>
+    <bundles>
+        <component name="vendor/packageA" version="0.0.0-dev"/>
+    </bundles>
+</phar>
+ */