Documenting ecodev becoming optionnal

Author: moufmouf

docs/CHANGELOG.md

@@ -6,6 +6,13 @@ sidebar_label: Changelog
 
 ## 4.1
 
+Breaking change:
+
+There is one breaking change introduced in the minor version (this was important to allow PHP 8 compatibility).
+
+- The **ecodev/graphql-upload** package (used to get support for file uploads in GraphQL input types) is now a "recommended" dependency only.
+  If you are using GraphQL file uploads, you need to add this package to your `composer.json`. 
+
 New features:
 
 - All annotations can now be accessed as PHP 8 attributes

docs/file_uploads.md

@@ -7,8 +7,16 @@ sidebar_label: File uploads
 GraphQL does not support natively the notion of file uploads, but an extension to the GraphQL protocol was proposed
 to add support for [multipart requests](https://github.com/jaydenseric/graphql-multipart-request-spec).
 
+## Installation
+
 GraphQLite supports this extension through the use of the [Ecodev/graphql-upload](https://github.com/Ecodev/graphql-upload) library.
 
+You must start by installing this package:
+
+```console
+$ composer require ecodev/graphql-upload
+```
+
 ## If you are using the Symfony bundle
 
 If you are using our Symfony bundle, the file upload middleware is managed by the bundle. You have nothing to do