Add initial set of files

config/bundles.php

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+<?php
+
+return [
+    Symfony\Bundle\FrameworkBundle\FrameworkBundle::class => ['all' => true],
+];

config/packages/cache.yaml

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+framework:
+    cache:
+        # Unique name of your app: used to compute stable namespaces for cache keys.
+        #prefix_seed: your_vendor_name/app_name
+
+        # The "app" cache stores to the filesystem by default.
+        # The data in this cache should persist between deploys.
+        # Other options include:
+
+        # Redis
+        #app: cache.adapter.redis
+        #default_redis_provider: redis://localhost
+
+        # APCu (not recommended with heavy random-write workloads as memory fragmentation can cause perf issues)
+        #app: cache.adapter.apcu
+
+        # Namespaced pools use the above "app" backend by default
+        #pools:
+            #my.dedicated.cache: null

config/packages/framework.yaml

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+# see https://symfony.com/doc/current/reference/configuration/framework.html
+framework:
+    secret: '%env(APP_SECRET)%'
+    #csrf_protection: true
+    http_method_override: false
+
+    # Enables session support. Note that the session will ONLY be started if you read or write from it.
+    # Remove or comment this section to explicitly disable session support.
+    session:
+        handler_id: null
+        cookie_secure: auto
+        cookie_samesite: lax
+        storage_factory_id: session.storage.factory.native
+
+    #esi: true
+    #fragments: true
+    php_errors:
+        log: true
+
+when@test:
+    framework:
+        test: true
+        session:
+            storage_factory_id: session.storage.factory.mock_file

config/packages/routing.yaml

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+framework:
+    router:
+        utf8: true
+
+        # Configure how to generate URLs in non-HTTP contexts, such as CLI commands.
+        # See https://symfony.com/doc/current/routing.html#generating-urls-in-commands
+        #default_uri: http://localhost
+
+when@prod:
+    framework:
+        router:
+            strict_requirements: null

config/preload.php

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+<?php
+
+if (file_exists(dirname(__DIR__).'/var/cache/prod/App_KernelProdContainer.preload.php')) {
+    require dirname(__DIR__).'/var/cache/prod/App_KernelProdContainer.preload.php';
+}

config/routes.yaml

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+#index:
+#    path: /
+#    controller: App\Controller\DefaultController::index

config/routes/framework.yaml

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+when@dev:
+    _errors:
+        resource: '@FrameworkBundle/Resources/config/routing/errors.xml'
+        prefix: /_error

config/services.yaml

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+# This file is the entry point to configure your own services.
+# Files in the packages/ subdirectory configure your dependencies.
+
+# Put parameters here that don't need to change on each machine where the app is deployed
+# https://symfony.com/doc/current/best_practices.html#use-parameters-for-application-configuration
+parameters:
+
+services:
+    # default configuration for services in *this* file
+    _defaults:
+        autowire: true      # Automatically injects dependencies in your services.
+        autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.
+
+    # makes classes in src/ available to be used as services
+    # this creates a service per class whose id is the fully-qualified class name
+    App\:
+        resource: '../src/'
+        exclude:
+            - '../src/DependencyInjection/'
+            - '../src/Entity/'
+            - '../src/Kernel.php'
+            - '../src/Tests/'
+
+    # add more service definitions when explicit configuration is needed
+    # please note that last definitions always *replace* previous ones