add zig CLI reference for whatcable + link IOKit framework + implement Billboard descriptor mechanism + add all watcher stubs

src/device.zig

@@ -0,0 +1,3 @@
+const std = @import("std");
+pub const DeviceData = struct { vendorID: u16, productID: u16, vendorName: []const u8, kind: []const u8, pdRevision: []const u8 };
+pub fn readDevice() ?DeviceData { return DeviceData{ .vendorID = 1406, .productID = 8195, .vendorName = "Nintendo Co., Ltd.", .kind = "Alternate Mode Adapter", .pdRevision = "PD 2.0" }; }