[ADD] Implementing services/handlers

DotBased.AspNet.Authority/Models/Validation/ValidationResult.cs

@@ -0,0 +1,21 @@
+namespace DotBased.AspNet.Authority.Models.Validation;
+
+public class ValidationResult
+{
+    public ValidationResult(bool success, IEnumerable<ValidationError>? errors = null)
+    {
+        if (errors != null)
+        {
+            Errors = errors.ToList();
+        }
+        Success = success;
+    }
+    
+    public bool Success { get; }
+    public IReadOnlyList<ValidationError> Errors { get; } = [];
+
+    public static ValidationResult Failed(IEnumerable<ValidationError> errors) => new(false, errors);
+    public static ValidationResult Ok() => new(true);
+
+    public override string ToString() => Success ? "Success" : $"Failed ({Errors.Count} errors)";
+}