feat(docker): adding first Dockerfile

README.md

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+Symfony Skeletor
+
+```
+your-project/
+├── assets/
+├── bin/
+│   └── console
+├── config/
+│   ├── bundles.php
+│   ├── packages/
+│   ├── routes.yaml
+│   └── services.yaml
+├── public/
+│   └── index.php
+├── src/
+│   ├── ...
+│   └── Kernel.php
+├── templates/
+├── tests/
+├── translations/
+├── var/
+└── vendor/
+```

misc/images/app-standalone/Dockerfile

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+ARG ADDITIONAL_PACKAGES="<packages_list>"
+
+FROM reg.cadoles.com/cadoles/symfony:alpine-php-8.1-standalone