configure the project

App/App.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

App/Program.cs

@@ -0,0 +1,7 @@
+namespace Game {
+    internal class Program {
+        static int Main(string[] args) {
+            return 0;
+        }
+    }
+}