Running your first 'Hello World' program on LinkIt Smart 7688

In this section, we are creating the first Hello world program through Node.js.

Generate a folder named app
```
      > mkdir app
```
Edit app.js
```
      > vim app.js
```
In app.js, press i and enter the following codes:
```
      console.log('Hello world');
```
Press ESC, then enter wq! to save and leave.
Enter node app.js and the result can be seen as below:
```
      > Hello world
```
Done!

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