Update Readme.md for package upload artifact

Author: wissem

README.md

@@ -70,6 +70,9 @@
             * [Delete a package](#delete-a-package)
             * [List all dependents of a package](#list-all-dependents-of-a-package)
             * [List all customers with access to a package](#list-all-customers-with-access-to-a-package)
+            * [Create a package uploaded file](#create-a-package-uploaded-file)
+            * [Create an artifact package](#create-an-artifact-package)
+            * [Update an artifact package files](#update-an-artifact-package-files)
          * [Credential](#credential)
             * [List an organization's credentials](#list-an-organizations-credentials)
             * [Show a credential](#show-a-credential)
@@ -95,7 +98,7 @@
          * [Validate incoming webhook payloads](#validate-incoming-webhook-payloads)
       * [License](#license)
 
-<!-- Added by: glaubinix, at: Mon  6 Jul 2020 14:07:03 BST -->
+<!-- Added by: wissem, at: Tue Jul 14 11:42:54 CEST 2020 -->
 
 <!--te-->
 
@@ -575,6 +578,29 @@ $client->packages()->listCustomers('acme-website/package');
 ```
 Returns a list of customers with access to the package.
 
+#### Create a package uploaded file
+
+```php
+$fileName = 'package1.zip'; // your package archive artifact containing a valid composer.json in root directory
+$file = file_get_contents($fileName);
+$client->packageArtifact()->create($file, 'application/zip', $fileName);
+```
+
+#### Create an artifact package
+
+```php
+$fileName = 'package1.zip';
+$file = file_get_contents($fileName);
+$response = $client->packageArtifact()->create($file, 'application/zip', $fileName);
+$artifactId = $response['id'];
+$client->packages()->createArtifactPackage([$artifactId]);
+```
+#### Update an artifact package files
+
+```php
+$packageUploadedFileIds = [42, 43];
+$client->packages()->editArtifactPackage('acme-website/package', $packageUploadedFileIds);
+```
 ### Credential
 
 #### List an organization's credentials