Add project files

StalwartSimpleLoginMiddleware/Entities/ApiKey.cs

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+using System.ComponentModel.DataAnnotations;
+using Microsoft.EntityFrameworkCore;
+
+namespace StalwartSimpleLoginMiddleware.Entities;
+
+public class ApiKey
+{
+    [Key]
+    [StringLength(88)]
+    [Unicode(false)]
+    public string Key { get; set; }
+
+    [Required] [StringLength(254)] public string OwnerEmail { get; set; }
+
+    public bool IsAdmin { get; set; }
+
+    public virtual ICollection<Member> Members { get; set; }
+}