add redux CLI based on redux GUI output formats

Il2CppInspector.Redux.CLI/Commands/ManualCommand.cs

@@ -0,0 +1,21 @@
+using Spectre.Console;
+using Spectre.Console.Cli;
+
+namespace Il2CppInspector.Redux.CLI.Commands;
+
+internal abstract class ManualCommand<T>(PortProvider portProvider) : BaseCommand<T>(portProvider) where T : ManualCommandOptions
+{
+    public override ValidationResult Validate(CommandContext context, T settings)
+    {
+        foreach (var inputPath in settings.InputPaths)
+        {
+            if (!Path.Exists(inputPath))
+                return ValidationResult.Error($"Provided input path {inputPath} does not exit.");
+        }
+
+        if (File.Exists(settings.OutputPath))
+            return ValidationResult.Error("Provided output path already exists as a file.");
+
+        return ValidationResult.Success();
+    }
+}