Update readme

README.md

@@ -19,6 +19,11 @@ This action sets up and installs Composer dependencies for PHP projects, with ca
     - **Default:** `**/composer.lock`
     - **Description:** Specifies the file to be hashed for the cache key. By default, it uses the `composer.lock` file, which reflects dependency versions.
 
+- **token** (optional):
+    - **Type:** `string`
+    - **Default:** `pkdt-***`
+    - **Description:** Deploy token to globally authenticate with packistry
+
 ## Usage Example
 
 Here’s an example of how to use this action in a workflow to install Composer dependencies and cache them based on the `composer.lock` file: