Update Node.js test projects and READMEs

Author: Chuxel

containers/javascript-node-8/.devcontainer/devcontainer.json

@@ -1,7 +1,6 @@
 {
 	"name": "Node.js 8",
 	"dockerFile": "Dockerfile",
-	"appPort": 3000,
 	"extensions": [
 		"dbaeumer.vscode-eslint"
 	]

containers/javascript-node-8/.vscode/launch.json

@@ -8,7 +8,9 @@
             "type": "node",
             "request": "launch",
             "name": "Launch Program",
-            "program": "${workspaceFolder}/test-project/server.js"
+            "program": "${workspaceFolder}/test-project/server.js",
+            "cwd": "${workspaceFolder}/test-project",
+            "preLaunchTask": "npm: install - test-project"
         }
     ]
 }

containers/javascript-node-8/README.md

@@ -10,16 +10,42 @@
 | *Definition type* | Dockerfile |
 | *Languages, platforms* | Node.js, JavaScript |
 
-## Usage
+## Using this definition with an existing folder
 
-[See here for information on using this definition with an existing project](../../README.md#using-a-definition).
+This definition does require any special steps to use. Just follow these steps:
 
-If you prefer, you can also just look through the contents of the `.devcontainer` folder to understand how to make changes to your own project.
+1. If this is your first time using a development container, please follow the [getting started steps](https://aka.ms/vscode-remote/containers/getting-started) to set up your machine.
 
-If you want to try out the test project instead, run **Remote-Container: Open Folder in Container...** in VS Code and select a cloned copy of the entire folder. You can then start the test program from Debug panel in VS Code.
+2. To use VS Code's copy of this definition:
+   1. Start VS Code and open your project folder.
+   2. Press <kbd>F1</kbd> select and **Remote-Containers: Create Container Configuration File...** from the command palette.
+   3. Select the Node.js 8 definition.
+
+3. To use latest-and-greatest copy of this definition from the repository:
+   1. Clone this repository.
+   2. Copy the contents of `containers/javascript-node-8/.devcontainer` to the root of your project folder.
+   3. Start VS Code and open your project folder.
+
+4. After following step 2 or 3, the contents of the `.devcontainer` folder in your project can be adapted to meet your needs.
+
+5. Finally, press <kbd>F1</kbd> and run **Remote-Containers: Reopen Folder in Container** to start using the definition.
+
+## Testing the definition
+
+This definition includes some test code that will help you verify it is working as expected on your system. Follow these steps:
+
+1. If this is your first time using a development container, please follow the [getting started steps](https://aka.ms/vscode-remote/containers/getting-started) to set up your machine.
+2. Clone this repository.
+3. Start VS Code, press <kbd>F1</kbd>, and select **Remote-Containers: Open Folder in Container...**
+4. Select the `containers/javascript-node-8` folder.
+5. After the folder has opened in the container, press <kbd>F5</kbd> to start the project. This will automatically run `npm install` before starting it.
+6. Once the project is running, press <kbd>F1</kbd> and select **Remote-Containers: Forward Port...**
+7. Select port 3000 and click the "Open Browser" button in the notification that appears.
+8. You should see "Hello remote world!" after the page loads.
+9. From here, you can add breakpoints or edit the contents of the `test-project` folder to do further testing.
 
 ## License
 
 Copyright (c) Microsoft Corporation. All rights reserved.
 
-Licensed under the MIT License. See [LICENSE](../../LICENSE).
+Licensed under the MIT License. See [LICENSE](https://github.com/Microsoft/vscode-dev-containers/blob/master/LICENSE).