Including external library (js and css)

[CMTV]

How to include external library (js and css files) in specific template that requires jQuery?

I tried this code in template forum_view:
HTML:

<xf:head option="questionthreads_iconpicker">
    <!-- Iconpicker styles -->
    <link rel="stylesheet" href="{{ base_url('src/addons/QuestionThreads/includes/libs/iconpicker/css/jquery.fonticonpicker.min.css') }}">
    <link rel="stylesheet" href="{{...

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