feat: add TextWidget

add TextWidget CRUD api

add basic tests for API

tests/Unit/TextWidgetModelTest.php

@@ -0,0 +1,15 @@
+<?php
+
+use App\Models\TextWidget;
+
+it('has correct fillable attributes', function () {
+    $expected = [
+        'title',
+        'description',
+        'content',
+    ];
+
+    $entry = new TextWidget;
+
+    expect($entry->getFillable())->toEqual($expected);
+});