Create README.md

Author: Alexandre PAIXAO

README.md

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+Installation
+============
+
+This bundle provides a caching mechanism at application level. It's very similar to HTTP caching at reverse-proxy level, but execution
+cache is done later. This way, the request has already been checked by the security layer but we can running the controller twice if
+the result should be the same.
+
+The cache storage will provide different result based on Request headers and body. If the exact same request is sent twice and the
+response is cached, the controller is not run and the response is sent.
+
+Step 1: Install the AdapterBundle
+---------------------------------
+
+This bundle uses a PSR-6 cache implementation provided by https://github.com/php-cache/adapter-bundle. It can be Memcached, Redis,
+Filesystem, Void or even your own implementation. The choice is yours!
+
+Please check their docs before installing this bundle.
+
+Step 2: Install the Bundle
+--------------------------
+
+Open a command console, go to your project directory and execute the
+following command to download the latest stable version of this bundle:
+
+```bash
+$ composer require stadline/execution-cache-bundle
+```
+
+This command requires you to have Composer installed globally, as explained
+in the [installation chapter](https://getcomposer.org/doc/00-intro.md)
+of the Composer documentation.
+
+Step 3: Enable the Bundle
+-------------------------
+
+Then, enable the bundle by adding the following line in the `app/AppKernel.php`
+file of your project:
+
+```php
+<?php
+// app/AppKernel.php
+
+// ...
+class AppKernel extends Kernel
+{
+    public function registerBundles()
+    {
+        $bundles = array(
+            // ...
+
+            new Stadline\ExecutionCacheBundle\StadlineExecutionCacheBundle(),
+        );
+
+        // ...
+    }
+
+    // ...
+}
+```
+
+Step 4: Add the ExecutionCache annotation
+-----------------------------------------
+
+To enable the cache, you must add an annotation on the controller method you want to be cached.
+
+```php
+<?php
+
+namespace AcmeBundle\Controller;
+
+use Symfony\Bundle\FrameworkBundle\Controller\Controller;
+use Symfony\Component\HttpFoundation\Request;
+use Stadline\ExecutionCacheBundle\Annotation\ExecutionCache;
+
+class BrandController extends Controller
+{
+    /**
+     * @ExecutionCache(lifetime=3600)
+     */
+    public function indexAction(Request $request)
+    {
+        // do some heavy stuff
+    }
+}
+```
+
+You can set a cache TTL if you want, but it's optional.
+
+_That's all!_
+
+Configuration
+-------------
+
+You can override the configuration easily
+
+```
+# Default configuration for extension with alias: "stadline_execution_cache"
+stadline_execution_cache:
+    storage:
+        prefix:               exc_
+        default_ttl:          300
+        pool_adapter:         cache
+```
+
+You can set the key prefix and the default TTL.
+
+The pool_adapter can be any CachePool implementation, check http://www.php-cache.com/en/latest/symfony/adapter-bundle/#configuration
+
+For example, if you defined a provider called ```my_filesystem``` you can use ```cache.provider.my_file_system``` (or just ```cache```
+if it's the default provider)