I am trying to install an extension with the help of composer for magento 2.
This is my composer.json file 

```
{
    "name": "ankur/module-quickorder",
    "description": "N/A",
    "require": {
        "php": "~5.6.5|7.0.2|7.0.4|~7.0.6",
        "magento/module-store": "100.0.0",
        "magento/module-backend": "100.0.0",
        "magento/module-media-storage": "100.0.0",
        "lib-libxml": "*"
    },
    "type": "magento2-module",
    "version": "100.0.0",
    "license": [
        "OSL-3.0",
        "AFL-3.0"
    ],
    "autoload": {
        "files": [ "registration.php" ],
        "psr-4": {
            "Ankur\\Quickorder\\": ""
        }
    }
}

```

After creating a composer, when I run this command in putty 

```
 composer require ankur/module-quickorder:100.0.0'

```

It throws below error in putty 

```
Installation issue: Do not run Composer as root/super user! See [https://getcomposer.org/root][1] for details
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

```

If anyone can explain the process of installing an extension with the help of composer, it will be appreciated.