Add initial implementation of API, database, and user management components.

MikrocopApi/Dtos/LoginRequestDto.cs

@@ -0,0 +1,14 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace MikrocopApi.Dtos;
+
+public sealed class LoginRequestDto
+{
+    [Required]
+    [StringLength(100, MinimumLength = 3)]
+    public string UserName { get; set; } = string.Empty;
+
+    [Required]
+    [StringLength(128, MinimumLength = 8)]
+    public string Password { get; set; } = string.Empty;
+}