Insert abbreviation of several terms

[ridhlab]

Hey. I'm glad to insert several terms which is it's a abbreviation of existing terms and have same meaning. This is same thing with "You" and "u" in english. Which is It's espicially used when chatting in social media. We know that "How are you" and "How are u" have the same meaning. So i'm glad to insert abbreviation of Indonesian to this repository.