[ADD] Implementing services/handlers

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

@@ -0,0 +1,24 @@
+namespace DotBased.AspNet.Authority.Models.Validation;
+
+public class ValidationError
+{
+    public ValidationError(string validator, string errorCode, string description)
+    {
+        Validator = validator;
+        ErrorCode = errorCode;
+        Description = description;
+    }
+    
+    /// <summary>
+    /// The validator name that generated this error.
+    /// </summary>
+    public string Validator { get; }
+    /// <summary>
+    /// The error code
+    /// </summary>
+    public string ErrorCode { get; }
+    /// <summary>
+    /// Error description
+    /// </summary>
+    public string Description { get; }
+}

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)";
+}