This is the base code to write extensions based in javascript plugins. It encapsulates the base widgets in terms of Yii2. One can use this base code during creation of one's own extensions if needed.
The preferred way to install this extension is through composer.
Either run
php composer.phar require --prefer-dist solutosoft/yii2-plugin "*"
or add
"dist solutosoft/yii2-plugin": "*"
to the require section of your composer.json file.