Add SDK

.github/workflows/php.yml

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+name: PHP Composer
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Validate composer.json and composer.lock
+      run: composer validate --strict
+
+    - name: Cache Composer packages
+      id: composer-cache
+      uses: actions/cache@v3
+      with:
+        path: vendor
+        key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-php-
+
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress
+
+    - name: Check coding style via ECS
+      run: vendor/bin/ecs check
+
+    - name: Run static analysis via PHPStan
+      run: vendor/bin/phpstan --xdebug analyse src tests
+
+    - name: Run test suite
+      run: composer run-script test

.gitignore

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+.phpunit.cache/
+.phpunit.result.cache
+composer.phar
+/vendor/

README.md

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-# sdk-php
-PHP SDK for Serverless Workflow
+# Serverless Workflow Specification - PHP SDK
+
+Provides the PHP API/SPI for the [Serverless Workflow Specification](https://github.com/serverlessworkflow/specification).
+
+With the SDK you can:
+* Programmatically build workflow definitions 
+* Parse workflow JSON and YAML definitions
+* Validate workflow definitions
+
+### Status
+
+Current SDK version conforms to the [Serverless Workflow specification v0.8](https://github.com/serverlessworkflow/specification/tree/0.8.x).
+
+
+## Installation
+
+```bash
+composer install serverlessworkflow/sdk
+```
+
+## Build 
+
+```php
+use Serverless\Workflow\Action;
+use Serverless\Workflow\ActionDataFilter;
+use Serverless\Workflow\FunctionDef;
+use Serverless\Workflow\FunctionRef;
+use Serverless\Workflow\OperationState;
+use Serverless\Workflow\Workflow;
+
+$workflow = new Workflow([
+    'id' => 'greeting',
+    'name' => 'Greeting Workflow',
+    'description' => 'Greet Someone',
+    'version' => '1.0',
+    'specVersion' => '0.8',
+    'start' => 'Greet',
+    'states' => [
+        new OperationState([
+            'name' => 'Greet',
+            'type' => 'operation',
+            'actions' => [
+                new Action([
+                    'functionRef' => new FunctionRef([
+                        'refName' => 'greetingFunction',
+                        'arguments' => [
+                            'name' => '${ .person.name }',
+                        ],
+                    ]),
+                    'actionDataFilter' => new ActionDataFilter([
+                        'results' => '${ .greeting }',
+                    ]),
+                ]),
+            ],
+            'end' => true,
+        ]),
+    ],
+    'functions' => [
+        new FunctionDef([
+            'name' => 'greetingFunction',
+            'operation' => 'file://myapis/greetingapis.json#greeting',
+        ]),
+    ],
+]);
+```
+
+## Parse
+
+### Convert from JSON/YAML source
+
+```php
+$workflow = Workflow::fromJson(file_get_contents('workflow.json'));
+
+$workflow = Workflow::fromYaml(file_get_contents('workflow.yaml'));
+```
+
+### Convert to JSON/YAML
+
+```php
+$json = $workflow->toJson();
+
+$yaml = $workflow->toYaml();
+```
+
+## Validate
+
+```php
+use Serverless\Workflow\WorkflowValidator;
+
+WorkflowValidator::validate($workflow);
+```
+
+The `validate` method will raise an exception if the provided workflow does not comply with the specification.

composer.json

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+{
+    "name": "taskvalve/serverless-workflow-php",
+    "description": "Provides the PHP API/SPI for the Serverless Workflow Specification.",
+    "type": "library",
+    "license": "MIT",
+    "autoload": {
+        "psr-4": {
+            "Serverless\\Workflow\\": "src/"
+        }
+    },
+    "authors": [
+        {
+            "name": "Richard McDaniel",
+            "email": "richard.lee.mcdaniel@gmail.com"
+        }
+    ],
+    "require-dev": {
+        "phpstan/phpstan": "^1.9",
+        "phpunit/phpunit": "^10.4",
+        "rector/rector": "^0.18.10",
+        "symplify/easy-coding-standard": "^11.1"
+    },
+    "require": {
+        "symfony/yaml": "^6.3",
+        "phpdocumentor/reflection-docblock": "^5.3",
+        "swaggest/json-schema": "^0.12.42"
+    },
+    "scripts": {
+        "rector": "vendor/bin/rector",
+        "ecs": "vendor/bin/ecs check --fix",
+        "stan": "vendor/bin/phpstan analyse src tests",
+        "test": "phpunit --testdox"
+    }
+}