Requested at https://translatewiki.net/wiki/Support#Request_to_Add_Sindhi_(Devangari)_on_translatewiki

Autonym: सिंधी (देवनागरी), Source: Government of India's CIIL Sindhi Devanagari Primer: https://ciil.gov.in/primers/Sindhi_(Devanagari)_Primer.pdf

ISO 639-3 code: sd-deva

• Add to language-data
  • Run src/util/ulsdata2json.php before adding
  • Run src/util/ulsdata2json.php after adding
• Add to translatewiki configuration
• Deploy configuration to translatewiki
• Add an entry to LocalNames/LocalNamesEn.php in the CLDR extension (if needed)
• Add jquery.ime keyboard (if needed)
  • Add keyboard documentation
• Update jquery.uls and jquery.ime in the ULS extension
• Deploy ULS to translatewiki
• Create the translatewiki language portal
• Make sure that the category for the language is not marked as disabled
• Update the translatewiki language portal to indicate that the language is enabled
• Add the requester (and possibly other relevant users) to the translators list on the portal
• Enter the autonym in the Wikimedia Portals project
• Test language search in UniversalLanguageSelector and fix the search index (if needed)

See documentation on how to add a language to translatewiki: https://www.mediawiki.org/wiki/Manual:Adding_and_removing_languages#translatewiki