Added delete maintenance

GET/POST maintenance note API

Step.Model/DatabaseModels/MaintenanceNoteModel.cs

@@ -0,0 +1,37 @@
+using Step.Model.DatabaseModels;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Step.Model.DatabaseModels
+{ 
+    [Table("maintenance_note")]
+    public class MaintenanceNoteModel
+    {
+        [Key]
+        [Column("id")]
+        public int Id { get; set; }
+        
+        [Column("message")]
+        public string Message { get; set; }
+
+        [Column("maintenance_id")]
+        public int? MaintenanceId { get; set; }
+
+        [ForeignKey("MaintenanceId")]
+        public MaintenanceModel Maintenance { get; set; }
+
+        [Column("user_id")]
+        public int? UserId { get; set; }
+
+        [ForeignKey("UserId")]
+        public UserModel User { get; set; }
+
+        [Column("timestamp")]
+        public DateTime DateTime { get; set; }
+    }
+}