:construction: add tag model

app/Models/Tag.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Tag extends Model
+{
+
+    protected $keyType = 'string';
+	protected $fillable = ['name' , 'owner_id'];
+
+    use HasFactory;
+
+    public function chapters()
+    {
+        return $this->belongsToMany('App\Models\ProgressChapter','tag_maps','tag_id','anchor_id');
+    }
+}