add nova resources

app/Modules/OutgoingLetter/OutgoingLetterModule.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace App\Modules\OutgoingLetter;
+
+use App\Modules\Makeable;
+use App\Modules\ModuleContract;
+
+class OutgoingLetterModule implements ModuleContract
+{
+    use Makeable;
+
+    /**
+     * Module is enabled
+     */
+    protected bool $enabled = true;
+
+    /**
+     * Check if is module enabled
+     */
+    public function isEnabled(): bool
+    {
+        return $this->enabled;
+    }
+
+    /**
+     * Disable module
+     */
+    public function disable(): void
+    {
+       $this->enabled = false;
+    }
+
+    /**
+     * Enable module
+     */
+    public function enable(): void
+    {
+       $this->enabled = true;
+    }
+
+    /**
+     * Check if module has a filament resource
+     */
+    public function hasFilamentResource(): bool
+    {
+        return true;
+    }
+}