refactor: change C file to .NET project

.gitignore

@@ -0,0 +1,2 @@
+bin/
+obj/

Program.cs

@@ -0,0 +1,2 @@
+// See https://aka.ms/new-console-template for more information
+Console.WriteLine("Hello, World!");

main.c

@@ -1,7 +0,0 @@
-#include <stdio.h>
-
-int main()
-{
-    printf("Halo, Welt!");
-    return 0;
-}

pwo_lab7.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>