Composer could not find a composer.json file in C:\xampp\htdocs\icapt-saas To initialize a project, please create a composer.json file as described in the https://getcomposer.org/ "Getting Started" section code example
Example: how to fix Composer could not find a composer.json file in Z:\xampp 7312\htdocs\project_karakter-master
curl -sS https://getcomposer.org/installer | php
mv composer.phar /usr/local/bin/composer