feat: ✨ Finish Iteration

Stream/Program.cs

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+// See https://aka.ms/new-console-template for more information
+
+Console.WriteLine("Hello, World!");

Stream/Stream.cs

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+namespace Stream;
+using System.IO;
+
+public class Stream
+{
+    public static bool ExistFile(string path)
+    {
+        return File.Exists(path);
+    }
+}

Stream/Stream.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net7.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>