added initial entries model

tests/Unit/EntryModelTest.php

@@ -0,0 +1,19 @@
+<?php
+
+use App\Models\Entry;
+
+it('has correct fillable attributes', function () {
+    $expected = [
+        'title',
+        'slug',
+        'description',
+        'is_published',
+        'is_featured',
+        'published_at',
+        'content',
+    ];
+
+    $entry = new Entry();
+
+    expect($entry->getFillable())->toEqual($expected);
+});