Backend login and register

src/Application/Common/Results/Result.cs

@@ -0,0 +1,37 @@
+namespace Application.Common.Results;
+
+public class Result
+{
+    protected Result(bool isSuccess, Error error)
+    {
+        if ((isSuccess && error != Error.None) || (!isSuccess && error == Error.None))
+            throw new InvalidOperationException("Invalid operation");
+        IsSuccess = isSuccess;
+        Error = error;
+    }
+
+    public bool IsSuccess { get; }
+    public bool IsFailure => !IsSuccess;
+
+    public Error Error { get; }
+
+    public static Result Success()
+    {
+        return new Result(true, Error.None);
+    }
+
+    public static Result<TValue> Success<TValue>(TValue value)
+    {
+        return new Result<TValue>(value, true, Error.None);
+    }
+
+    public static Result Failure(Error error)
+    {
+        return new Result(false, error);
+    }
+
+    public static Result<TValue> Failure<TValue>(Error error)
+    {
+        return new Result<TValue>(default!, false, error);
+    }
+}