examples: Add example that perform directory listing

examples/list_dir.zig

@@ -0,0 +1,33 @@
+const std = @import("std");
+const Io = std.Io;
+
+const Simulator = @import("zigmulator");
+
+fn listDirProgram(init: std.process.Init) anyerror!void {
+    try Io.Dir.cwd().createDir(init.io, "workspace", .default_dir);
+
+    const workspace = try Io.Dir.cwd().openDir(init.io, "workspace", .{ .iterate = true });
+    defer workspace.close(init.io);
+
+    const data_file = try workspace.createFile(init.io, "data.txt", .{});
+    data_file.close(init.io);
+    try workspace.createDir(init.io, "archive", .default_dir);
+
+    var stdout = Io.File.stdout().writerStreaming(init.io, &.{});
+    var iterator = workspace.iterate();
+    while (try iterator.next(init.io)) |entry| {
+        try stdout.interface.print("{s}: {s}\n", .{ entry.name, @tagName(entry.kind) });
+    }
+    try stdout.interface.flush();
+}
+
+pub fn main(init: std.process.Init) !void {
+    var sim: Simulator = undefined;
+    sim.init(std.heap.page_allocator, init.io);
+    defer sim.deinit();
+
+    try sim.addExecutable("list_dir", listDirProgram);
+    try sim.spawn("list_dir", .{});
+
+    while (sim.scheduleOne()) {}
+}