add assessment feature

app/Models/StudentAssessmentModel.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace App\Models;
+
+use CodeIgniter\Model;
+
+class StudentAssessmentModel extends Model
+{
+    protected $table = 'student_assessments';
+    protected $primaryKey = 'id';
+    protected $returnType = 'array';
+    protected $allowedFields = ['form_id', 'student_id', 'status', 'assigned_at', 'started_at', 'submitted_at', 'graded_at', 'graded_by', 'score', 'education_committee_note'];
+    protected $useTimestamps = true;
+}