Add C# console app that prints numbers 1-10

[Copilot]

New .NET 10 console app (NumberPrinter) that writes numbers 1–10 to stdout.

• NumberPrinter/Program.cs — for loop printing 1–10 via Console.WriteLine
• NumberPrinter/NumberPrinter.csproj — Standard .NET 10 console app target
• .gitignore — Excludes bin/, obj/, and IDE artifacts

for (int i = 1; i <= 10; i++)
{
    Console.WriteLine(i);
}

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