Added standard bundle installation instructions

cookbook/bundles/best_practices.rst

@@ -194,6 +194,59 @@ Extensive documentation should also be provided in the
 the ``Resources/doc/`` directory; the ``Resources/doc/index.rst`` file is
 the only mandatory file and must be the entry point for the documentation.
 
+Installation Instructions
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+In order to ease the installation of third-party bundles, consider using the
+following standardized instructions in your ``README.md`` file.
+
+.. code-block:: text
+
+    Installation
+    ============
+
+    Step 1: Download the Bundle
+    ---------------------------
+
+    Open a command console, enter your project directory and execute the
+    following command to download the latest stable version of this bundle:
+
+    ```bash
+    $ composer require <package-name> "~1"
+    ```
+
+    This command requires to have Composer installed globally, as explained
+    in the [installation chapter](https://getcomposer.org/doc/00-intro.md)
+    of Composer documentation.
+
+    Step 2: Enable the Bundle
+    -------------------------
+
+    Then, enable the bundle adding the following line in the `AppKernel`
+    class of your project:
+
+    ```php
+    <?php
+    // app/AppKernel.php
+
+    // ...
+
+    public function registerBundles()
+    {
+        $bundles = array(
+            // ...
+            return new <vendor>\<bundle-name>\<bundle-long-name>(),
+        );
+    }
+    ```
+
+This template assumes that your bundle is in its ``1.x`` version. If not, change
+the ``"~1"`` installation version accordingly (``"~2"``, ``"~3"``, etc.)
+
+Optionally, you can add more installation steps (*Step 3*, *Step 4*, etc.) to
+explain other required installation tasks, such as registering routes or
+dumping assets.
+
 Routing
 -------