Create a zip file in C#

dotnet new console -o CreateZip && cd CreateZip
dotnet add package RecursiveAI.OneArchive --version 1.0.0

using RecursiveAI.OneArchive;
 
// Something to zip: a folder with two files, and a README.
Directory.CreateDirectory("report");
File.WriteAllText("report/summary.txt", "Q3: 444 orders shipped.\n");
File.WriteAllLines("report/orders.csv",
    Enumerable.Range(1, 500).Select(i => $"{i},order-{i},shipped"));
File.WriteAllText("README.md", "# Q3 report\n");
 
// The format comes from the extension: .zip here.
Archive.Create("q3.zip")
    .Add("report/")                       // a folder, with everything in it
    .Add("README.md", "docs/readme.md")   // a file, stored under another name
    .Save();
 
Console.WriteLine($"q3.zip: {new FileInfo("q3.zip").Length:N0} bytes");
using var zip = Archive.Open("q3.zip");
foreach (var e in zip.Entries)
    Console.WriteLine($"  {e.Kind,-9} {e.Size,7:N0}  {e.Name}");

q3.zip: 2,489 bytes
  Directory       0  report
  File       10,784  report/orders.csv
  File           24  report/summary.txt
  File           12  docs/readme.md