Build improvements

This adds a `build` and `clean` commands to `composer.json` to enable
easier discovery of the build process for new developers.

Due to the `clean` deleting the raw directory. I've moved the gitignore
into the top level `.gitignore`.

The available commands are added to the README.md

Add single schema generation commands to README

We need to explain about the need for `--` in composer commands

.gitignore

@@ -18,3 +18,5 @@ composer.lock
 
 # OS X
 **/.DS_Store
+
+resources/models/raw

README.md

@@ -67,6 +67,7 @@ This README is divided into several sections:
 * [Naming conventions](#naming-conventions)
 * [API versions](#api-versions)
 * [Working with DTOs](#working-with-dtos)
+* [Contributing](#contributing)
 
 ## Getting Started
 
@@ -532,3 +533,37 @@ $response = $ordersApi->confirmShipment(
     confirmShipmentRequest: $confirmShipmentRequest,
 )
 ```
+
+## Contributing
+
+To regenerate the library, you can run 
+
+    # composer clean
+    # composer build
+
+Composer has a number of pre-configured scripts in `composer.json`:
+
+* `build`: Run all the stages to regenerate the PHP files
+* `clean`: Delete all the generated PHP and JSON files
+* `lint`: Run PHP-CS-Fixer 
+* `schema:download`: Download the schemas from Amazon
+* `schema:generate`: Generate the PHP files from the schemas
+* `schema:refactor`: Make local modifications to the schemas before generation
+
+If you want to generate a specific schema, you can use the `--schema` option:
+
+    # composer schema:generate -- --schema=orders
+
+You can also generate just the seller or vendor schemas:
+
+    # composer schema:refactor -- --category=seller
+    # composer schema:generate -- --category=vendor
+
+You can also combine both options:
+
+    # composer schema:download -- --schema=orders --category=seller
+
+The schema commands use the underlying `./bin/console` command. To get a list of
+available commands, run:
+
+    # php ./bin/console list

composer.json

@@ -22,8 +22,10 @@
     "require": {
         "php": ">=8.2",
         "ext-curl": "*",
+        "ext-dom": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
+        "ext-simplexml": "*",
         "guzzlehttp/guzzle": "^6.0|^7.0",
         "saloonphp/saloon": "^3.4",
         "openspout/openspout": "^4.23",
@@ -55,6 +57,13 @@
         }
     },
     "scripts": {
+        "build": [
+            "@schema:download",
+            "@schema:refactor",
+            "@schema:generate",
+            "@lint"
+        ],
+        "clean": "rm -rf src/Vendor src/Seller resources/models/seller resources/models/vendor resources/models/raw",
         "lint": [
             "@pint",
             "@php-compatibility-check"
@@ -63,6 +72,9 @@
         "php-compatibility-check": "./vendor/bin/phpcs -p ./src ./bin --standard=PHPCompatibility --runtime-set testVersion 8.2-",
         "post-install-cmd": "\"vendor/bin/phpcs\" --config-set installed_paths vendor/phpcompatibility/php-compatibility",
         "post-update-cmd": "\"vendor/bin/phpcs\" --config-set installed_paths vendor/phpcompatibility/php-compatibility",
+        "schema:download": "@php bin/console schema:download",
+        "schema:generate": "@php bin/console schema:generate",
+        "schema:refactor": "@php bin/console schema:refactor",
         "test": "vendor/bin/phpunit"
     },
     "config": {