The language code tig
Language name in the language itself or English: Tigre
The used script, if not obvious: Geez script
Where and when the language was or is used: by Tigre speakers in Eritrea and Sudan, East African

Tagging language committee members for input @Amire80 , @jhsoby , Language-Technical Support

What type of support do you need? terms, monolingual texts or lexemes?

No problem with adding this.

However: @Bbeshir I know you've already started localization of MediaWiki into Tigré on Translatewiki.net. If you complete the translation of the most used messages there, Tigré will automatically be enabled for all purposes, including Wikidata support. So I suggest focusing on that at the moment. But that suggestion shouldn't be a blocker for the Wikidata team to add the tig code in the meantime. :-)

@jhsoby thank you for the advise, I am continuring to translate. When the language is added for all purposes, is Wikipedia also included. It would be nice to include that?

In T353686#9414745, @Bugreporter wrote:

What type of support do you need? terms, monolingual texts or lexemes?

It's already supported for monolingual text (example) and lexemes (example). The only thing missing is labels.

In T353686#9424390, @Bbeshir wrote:

@jhsoby thank you for the advise, I am continuring to translate. When the language is added for all purposes, is Wikipedia also included. It would be nice to include that?

Not automatically. Translating the most used messages is one of several requirements to start a new Wikipedia; the most important other requirement is to have continuous activity from several users over several months in the Wikimedia Incubator (statistics). See the language proposal policy for more info.