Adding support for capturing the output of a node instance for custom logging implementations.

src/Microsoft.AspNetCore.NodeServices/Util/ConsoleNodeInstanceOutputLogger.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace Microsoft.AspNetCore.NodeServices.Util
+{
+    public class ConsoleNodeInstanceOutputLogger : INodeInstanceOutputLogger
+    {
+        public void LogOutputData(string outputData)
+        {
+            Console.WriteLine("[Node] " + outputData);
+        }
+
+        public void LogErrorData(string errorData)
+        {
+            Console.WriteLine("[Node] " + errorData);
+        }
+    }
+}