Add project files.

Inspectron.Epson/PrintServer/JobSources/SingleJobSource.cs

@@ -0,0 +1,18 @@
+using System.Threading.Channels;
+
+namespace Inspectron.Epson.PrintServer.JobSources;
+
+public class SingleJobSource: IPrintJobSource
+{
+    public SingleJobSource(PrintJob job)
+    {
+        _channel.Writer.WriteAsync(job);
+    }
+
+    private Channel<PrintJob> _channel = Channel.CreateUnbounded<PrintJob>();
+    public async Task<PrintJob> GetNextJobAsync(CancellationToken cancellationToken)
+    {
+        return await _channel.Reader.ReadAsync(cancellationToken);
+    }
+}
+