Set up print cards interface and start sample implementation

Work on #53

app/Actions/Print/PrintCards.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Actions\Print;
+
+use Illuminate\Support\Collection;
+
+interface PrintCards
+{
+    public function print(Collection $entries);
+}

app/Actions/Print/QuarterPageCards.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Actions\Print;
+
+class QuarterPageCards
+{
+    public function __construct()
+    {
+    }
+
+    public function __invoke(): void
+    {
+        //
+    }
+}

app/Providers/PrintCardActionProvider.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Providers;
+
+use App\Actions\Print\PrintCards;
+use App\Actions\Print\QuarterPageCards;
+use Illuminate\Support\ServiceProvider;
+
+class PrintCardActionProvider extends ServiceProvider
+{
+    /**
+     * Register services.
+     */
+    public function register(): void
+    {
+        $this->app->singleton(PrintCards::class, QuarterPageCards::class);
+    }
+
+    /**
+     * Bootstrap services.
+     */
+    public function boot(): void
+    {
+        //
+    }
+}

bootstrap/providers.php

@@ -4,5 +4,6 @@ return [
     App\Providers\AppServiceProvider::class,
     App\Providers\FortifyServiceProvider::class,
     App\Providers\InvoiceDataServiceProvider::class,
+    App\Providers\PrintCardActionProvider::class,
     Barryvdh\Debugbar\ServiceProvider::class,
 ];