docs: function addCommandOnCmdEditor (config) {
  
  	var cmd_name = null;
  
  	var promise = inquirer.prompt([{
  		type: 'input',
  		name: 'cmdName',
  		message: 'What is name of a command (e.g. setMotorPower) ?',
  		validate: function (value) {
  			if (value.length == 0) return true;
  			if (config.commands[value] != null) return 'This command name has already existed.';
  			if (!value.match(/^[A-Za-z0-9_]+$/)) return 'Available characters for argument name: A-Z, a-z, 0-9, underscore.\n\
  Or, if you want to cancel, please press the enter key left empty.';
  			return true;
  		}
  
  	}]).then(function (answer) {
  
  		cmd_name = answer.cmdName || null;
  		if (cmd_name == null || cmd_name.length == 0) {
  			return null;
  		}
  
  		return inquirer.prompt([{
  			type: 'input',
  			name: 'cmdDesc',
  			message: 'What is description of ' + cmd_name + ' command ?'
  		}]);
  
  
  	}).then(function (answer) {
  
  		if (cmd_name == null) return false;
  
  		var commands = config.commands || {};
  		commands[cmd_name] = {
  			description: answer.cmdDesc || null,
  			args: {}
  		};
  
  		// Done
  		console.log(colors.bold.green('This command has been created: ' + cmd_name));
  
  		// Save to the commands file
  		console.log('\nWriting to ' + process.cwd() + '/' + COMMANDS_FILENAME);
  		fs.writeFileSync(COMMANDS_FILENAME, JSON.stringify(config.commands));
  		console.log('Writing has been completed.\n\n');
  		return true;
  
  	});
  
  	return promise;
  
  }