add fp1 sample

csharp-fp1/Program.cs

@@ -0,0 +1,28 @@
+using CsharpFp1.Application;
+using CsharpFp1.Domain;
+using CsharpFp1.Infrastructure;
+
+namespace CsharpFp1;
+
+public class Program
+{
+    public static void Main()
+    {
+        Console.WriteLine("[csharp-fp1] Starting withdraw money demo...");
+
+        var (loadAccount, saveAccount) = InMemoryAccount.Create();
+        var withdrawMoney = AccountApplication.CreateWithdrawMoney(loadAccount, saveAccount);
+
+        var accountId = Guid.NewGuid();
+        Console.WriteLine($"[csharp-fp1] Seeding account {accountId} with opening balance 200.00");
+        saveAccount(new Account(accountId, new Money(200m)));
+
+        decimal amount = 100m;
+        Console.WriteLine(
+            $"[csharp-fp1] Executing withdrawal {amount:0.00} from account {accountId}"
+        );
+        withdrawMoney(accountId, amount);
+
+        Console.WriteLine("[csharp-fp1] Demo completed.");
+    }
+}