createAccount method
Register a new user.
Param username The username. The maximum length is 64 characters. Ensure that you set this parameter.
Supported characters include the 26 English letters (a-z), the ten numbers (0-9), the underscore (_), the hyphen (-),
and the English period (.). This parameter is case insensitive, and upper-case letters are automatically changed to low-case ones.
If you want to set this parameter as a regular expression, set it as ^a-zA-Z0-9_-+$.
Param password The password. The maximum length is 64 characters. Ensure that you set this parameter.
Throws A description of the exception. See {@link EMError}.
Implementation
Future<void> createAccount(String username, String password) async {
await EMClient.getInstance.createAccount(username, password);
}