Write dart api docs (member, user, server, channels)

[LeadcodeDev]

Write dart methods documentations.

Example

final class Server {
  /// Simply explication
  ///
  /// More function details
  ///
  /// Constrants (if exists)
  /// 
  /// Usage :
  /// `code`
  Future<void> setName(String value) => ...
}

Steps

• Member
• User
• Server
• Channels