Draft: Feat: Implementation JOIN and PART command

#26 (closed) #13 (closed) #27 (closed)

• JOIN

• Can join channels
• Notified when user join the chan too
• Error management: Key needed to connect no key/ bad key
• Error management: Limit nb user in channel
• Error management: user join a bad channel
• ...

• PART

• Can leave channels
• Notify all channel members when someone disconnect
• Notified when user leave the chan too
• ...