Setup basic code for login.

API/DTOs/LoginDto.cs

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+namespace API.DTOs
+{
+    public class LoginDto
+    {
+        public string Username { get; set; }
+        public string Password { get; set; }
+    }
+}

API/DTOs/RegisterDto.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace API.DTOs
+{
+    public class RegisterDto
+    {
+        [Required]
+        public string Username { get; set; }
+        [Required]
+        [StringLength(8, MinimumLength = 4)]
+        public string Password { get; set; }
+    }
+}

API/DTOs/UserDto.cs

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+namespace API.DTOs
+{
+    public class UserDto
+    {
+        public string Username { get; set; }
+        public string Token { get; set; }
+    }
+}