chat

CLI chat. User can run multiple clients

###Requirements

• Both client and server should be console apps. Users send messages to chat via stdin prompt
• Users must specify their names when joining the chat
• Each message is broadcasted to all chat members
• Same user (identified by the same name) can have multiple simultaneous clients running.
• Online status calculation: a user is "online" when he/she has at least one client running, otherwise the user is "offline".
• The server must notify all chat members when some user comes online or goes offline.

Should look like: server: Alice is online server: Bob is online Alice: anybody home? Bob: hi server: Alice is offline

• Client and server should be written in golang
• Any network protocols can be used
• Clean, readable code. Simplicity is a plus (- All errors and network failures must be handled)