Add Dependency Injection example to the readme

split: 6634791472b3054c9fefdaa37789dc72013ba1e9

Author: kylekatarnls

README.md

@@ -1,9 +1,9 @@
 
-Phug Formatter
-========
+Phug Dependency Injection
+=========================
 
 What is Phug Dependency Injection?
------------------
+----------------------------------
 
 This project allow to provide helpers functions and values,
 to require them and to dump all required dependencies as
@@ -20,3 +20,31 @@ composer require phug/dependency-injection
 
 Usage
 -----
+
+```php
+use Phug\DependencyInjection;
+
+$dependencies = new DependencyInjection();
+$dependencies->register('limit', 42);
+$dependencies->provider('clock', static function () {
+    return new Clock();
+});
+
+$dependencies->provider('expiration', ['clock', 'limit', static function (ClockInterface $clock, $limit) {
+    return static function ($margin) use ($clock, $limit) {
+        $delta = $limit - $margin;
+
+        return $clock->now()->modify("$delta days");
+    };
+}]);
+
+$expiration = $dependencies->call('expiration'); // return new DateTimeImmutable('now + 42 days')
+$expiration = $dependencies->call('expiration', 20); // return new DateTimeImmutable('now + 22 days')
+```
+
+Security contact information
+----------------------------
+
+To report a security vulnerability, please use the
+[Tidelift security contact](https://tidelift.com/security).
+Tidelift will coordinate the fix and disclosure.