https://github.com/erusev/parsedown

download the Parsedown.php
and put it into Library folder
then edit autoload.php

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$autoload['libraries'] = array('Parsedown');

then in the view php for tests:

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$text = 'Hello **Parsedown**!';
$result = Parsedown::instance()->parse($text);
echo $result;

No need to require or include the file.
If you want to load a file with path, you can use the function called file_get_contents:

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file_get_contents('./markdown/test.md',true); (true: enable path)