docs: document unit, integration, and installation (#4)

.github/workflows/integration-README.md

@@ -0,0 +1,31 @@
+# Integration Tests for a Magento Package
+
+A Github Workflow that runs the Integration Tests of a Magento Package
+
+## Inputs
+
+See the [integration.yaml](./integration.yaml)
+
+## Usage
+
+```yml
+name: Integration Test
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - main
+
+jobs:
+  integration-workflow:
+    uses: graycoreio/github-actions-magento2/.github/workflows/integration.yaml@main
+    with:
+      package_name: YOUR_PACKAGE_NAME
+      source_folder: $GITHUB_WORKSPACE
+      test_command: ../../../vendor/bin/phpunit ../../../vendor/YOUR_VENDOR/YOUR_PACKAGE_NAME/Test/Integration
+    secrets:
+      composer_auth: ${{ secrets.COMPOSER_AUTH }}
+```

.github/workflows/unit.yaml

@@ -15,7 +15,7 @@ on:
     - README.md
 
 jobs:
-  install-test:
+  unit-test:
     strategy:
       matrix:
         php_version: