Add project files.

QuickMVVMSetup/RelayCommand.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace QuickMVVMSetup
+{
+    public class RelayCommand : ICommand
+    {
+        public event EventHandler? CanExecuteChanged;
+        private Action<object> _executeAction;
+        private Func<object, bool> _canExecuteAction;
+        public bool CanExecute(object? parameter)
+        {
+            if (_canExecuteAction == null)
+            {
+                return true;
+            }
+            return _canExecuteAction.Invoke(parameter);
+        }
+
+        public void Execute(object? parameter)
+        {
+            _executeAction.Invoke(parameter);
+        }
+
+        public RelayCommand(Action<object> executeAction, Func<object, bool> canExecuteFunc)
+        {
+            _executeAction = executeAction;
+            _canExecuteAction = canExecuteFunc;
+        }
+    }
+}