move shared content to shared project

MareSynchronosServer/MareSynchronosShared/Models/LodeStoneAuth.cs

@@ -0,0 +1,16 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace MareSynchronosShared.Models
+{
+    public class LodeStoneAuth
+    {
+        [Key]
+        public ulong DiscordId { get; set; }
+        [MaxLength(100)]
+        public string HashedLodestoneId { get; set; }
+        [MaxLength(100)]
+        public string? LodestoneAuthString { get; set; }
+        public User? User { get; set; }
+        public DateTime? StartedAt { get; set; }
+    }
+}