Add hint: Node.js Module creation may take some time (#484)

* Add hint: Node.js Module creation may take some time

* Update

src/edge/edgeManager.ts

@@ -504,6 +504,7 @@ export class EdgeManager {
                 }
             case Constants.LANGUAGE_NODE:
                 try {
+                    outputChannel.appendLine("Node.js Module creation may take about 1 minute.");
                     if (Versions.installNodeTemplate()) {
                         // Have to install Node.js module template and Yeoman in the same space (either global or npx environment)
                         // https://github.com/Microsoft/vscode-azure-iot-edge/issues/326