how to add widget in yii2?

Question

Yii

how to add this widget
https://github.com/2amigos/yii2-file-upload-widget
in yii2?
I can't understand how composer works, that's why there are problems.
If anyone understood the instructions - can you chew it? Step by step for those who are on the armored train.
Thanks in advance. Links to an explanatory description of the principle of composer robots are also welcome, but this is secondary.

Answer 1

It's also written in the README ...
In the console
or in composer.json
An example of adding to the page is here (this is in the view)

Answer 2

open console enter project root write
php composer.phar require "2amigos/yii2-file-upload-widget" "*"
get
Failed loading C:\xampp\php\ext\php_eaccelerator_ts.dll
Could not open input file: composer.phar

Answer 3

By composer here
By widgets here )))
Good luck