node installation instruction

01 Intro to NodeJS.md

@@ -31,12 +31,38 @@ It is assumed that you can already program in a modern language such as Python o
 
 Make sure you have cloned the repository containing the sample code by following the instructions in the previous chapter.
 
+## 1 Installing Node
+
+The simplest way to install the latest version of Node is to use the [Node Version Manager](https://github.com/creationix/nvm) tool. This can be installed using `cURL` as shown below.
+```
+curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.5/install.sh | bash
+```
+Now you need to close the terminal and relaunch it. Try displaying the version of nvm.
+```
+nvm --version
+```
+If the nvm command is not found, make sure your `~/.profile` file contains the following line (add it if needed) then restart terminal and try again.
+```
+[[ -s $HOME/.nvm/nvm.sh ]] && . $HOME/.nvm/nvm.sh  # This loads NVM
+```
+Once this has been installed we can use it to list all the versions of node available and then installing the latest version:
+```
+$ nvm list-remote
+  ...
+  v8.5.0
+  v8.6.0
+  v8.7.0
+$ nvm install 8.7.0
+$ node -v
+  v8.7.0
+```
+
 ## 1 Node Packages
 
 NodeJS can be extended through the use of **packages** and these are installed using the **Node Package Manager**. This was installed when we installed Node.
 ```
 $ npm -v
-  5.0.0
+  5.4.2
 ```
 
 One of the most valuable features of NodeJS is its package manager which allows you to install additional functionality in the form of _packages_. There are thousands of these to choose from and, in a later chapter, you will be shown how you can publish your own packages.