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

MikrocopDb/Entities/UserEntity.cs

@@ -0,0 +1,14 @@
+namespace MikrocopDb.Entities;
+
+public sealed class UserEntity
+{
+    public Guid Id { get; set; }
+    public required string UserName { get; set; }
+    public required string FullName { get; set; }
+    public required string Email { get; set; }
+    public required string MobileNumber { get; set; }
+    public required string Language { get; set; }
+    public required string Culture { get; set; }
+    public required string PasswordHash { get; set; }
+    public required string PasswordSalt { get; set; }
+}