Add Component of Avatar + Avatar Group

Purpose: Display a user profile image in a circular shape. Can optionally show if the user is online.

Features:-

Circular profile picture
Rounded with border-radius: 50% (Tailwind: rounded-full).

Online status indicator
Small green dot at the corner if online={true}.

Different sizes
Small (sm), Medium (md), Large (lg) to fit UI needs.

@Gyanthakur 