Add Noto Sans Syloti Nagri font to Extension:UniversalLanguageSelector for Sylheti Nagari script. This script is currently majorly being used in Sylheti Wikipedia and in a few Bangla books in Bangla Wikisource. Currently no font is supported for this script on Wikimedia sites and users have to install fonts separately to read or edit this script (see here)
Noto Sans Syloti Nagri font is an open source font developed by Google under SIL Open Font License, Version 1.1
Font url: https://fonts.google.com/noto/specimen/Noto+Sans+Syloti+Nagri?preview.script=Sylo&preview.lang=syl_Sylo
Github repo: https://github.com/notofonts/syloti-nagri