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the first page of the documentation literally spells out how to add CSS to the project.
Copy-paste the stylesheet link into your head before all other stylesheets to load our CSS.
<link rel="stylesheet" href="https://unpkg.com/@coreui/coreui/dist/css/coreui.min.css">
If you want to setup a starter template then simply use the follow:
git clone https://github.com/coreui/coreui-free-bootstrap-admin-template.git my-project
# clone the repo
$ cd my-project
# go into app's directory
$ npm install
# install app's dependencies
edit: Forgot to mention to check out Vuetfiy – my personal favourite UI library for Vue
Source:stackexchange.com