Installing CraftQL plugin I wanted to know if there is any way to install markhuot/craftql via the command line.

I tried to follow the one-liner instruction here:
https://github.com/markhuot/craftql#installation

composer require markhuot/craftql:^1.0.0


but after installing I don't see the options in the backend.
You should be able to install the plugin with
./craft install/plugin craftql. Composer will only download the package and add it to composer.json