Add authentication

Website/Models/LoginRequest.cs

@@ -0,0 +1,7 @@
+namespace Website.Models {
+	public class LoginRequest {
+		public string Username { get; set; }
+		public string Password { get; set; }
+		public string ReturnUrl { get; set; }
+	}
+}

Website/Models/User.cs

@@ -0,0 +1,29 @@
+using System.Security.Cryptography;
+using System.Text;
+using Website.Data.States;
+
+namespace Website.Models {
+	public class User {
+		public User(UserState state) {
+			Username = state.User_Email;
+			Password = state.User_Password;
+		}
+
+		public bool ValidatePassword(string password) {
+			using (var sha256 = SHA256.Create()) {
+				var hash = sha256.ComputeHash(Encoding.UTF8.GetBytes(password));
+
+				var builder = new StringBuilder();
+				foreach (var b in hash)
+					builder.Append(b.ToString("x2"));
+				var hashString = builder.ToString();
+
+				return hashString == Password;
+			}
+		}
+
+
+		public string Username { get; set; }
+		public string Password { get; set; }
+	}
+}