Installation:

Step 1. Add module to the composer.json

"mjankiewicz/configurableproduct": "dev-master"

Example:

"require": {
    "magento/product-community-edition": "2.1.0",
    "composer/composer": "@alpha",
    "mjankiewicz/configurableproduct": "dev-master"
}

Step 2. Update composer

composer update

Step 3. Enable the module:

php bin/magento module:enable JanSoft_ConfigurableProduct

Step 4 Upgrade the Magento application

php bin/magento setup:upgrade

Step 5. Generate DI configuration

php bin/magento setup:di:compile

Step 6. Clear cache

php bin/magento cache:flush