Update documentation

README.md

@@ -3,6 +3,24 @@
 Enables PSR-16 Simple Cache services in Symfony projects. These were previously
 enabled in the older Symfony version but were removed in 4.3.
 
+## Synopsis
+
+```php
+use Psr\SimpleCache\CacheInterface;
+
+class SomeService
+{
+    public function __construct(private CacheInterface $cache)
+    {
+    }
+
+    public function doSomething()
+    {
+        $this->cache->set('foo', 'bar');
+    }
+}
+```
+
 ## Documentation
 
 [rekalogika.dev/psr-16-simple-cache-bundle](https://rekalogika.dev/psr-16-simple-cache-bundle)
@@ -13,4 +31,13 @@ This package is just a service definition. The actual implementation is done by
 the Symfony project; they just don't make the service available by default.
 
 * [Adapters For Interoperability between PSR-6 and PSR-16 Cache](https://symfony.com/doc/current/components/cache/psr6_psr16_adapters.html)
-* [Service definition by Tobion](https://github.com/symfony/symfony/issues/28918#issuecomment-433489302)
+* [Service definition by Tobion](https://github.com/symfony/symfony/issues/28918#issuecomment-433489302)
+
+## License
+
+MIT
+
+## Contributing
+
+Issues and pull requests should be filed in the GitHub repository
+[rekalogika/psr-16-simple-cache-bundle](https://github.com/rekalogika/psr-16-simple-cache-bundle).