Added usage for -remember-password

Not very well explained how to use -remember-password. This simple change to the README should contain everything users need to know about it.
Also added to code help.

DepotDownloader/Program.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.IO;
@@ -389,7 +389,7 @@ namespace DepotDownloader
             Console.WriteLine();
             Console.WriteLine("\t-username <user>\t\t- the username of the account to login to for restricted content.");
             Console.WriteLine("\t-password <pass>\t\t- the password of the account to login to for restricted content.");
-            Console.WriteLine("\t-remember-password\t\t- if set, remember the password for subsequent logins of this user.");
+            Console.WriteLine("\t-remember-password\t\t- if set, remember the password for subsequent logins of this user. (Use \"-username <username> -remember-password\" as login credentials)");
             Console.WriteLine();
             Console.WriteLine("\t-dir <installdir>\t\t- the directory in which to place downloaded files.");
             Console.WriteLine("\t-filelist <file.txt>\t- a list of files to download (from the manifest). Prefix file path with 'regex:' if you want to match with regex.");

README.md

@@ -44,7 +44,7 @@ Parameter | Description
 -pubfile \<#>			| the PublishedFileId to download. (Will automatically resolve to UGC id)
 -username \<user>		| the username of the account to login to for restricted content.
 -password \<pass>		| the password of the account to login to for restricted content.
--remember-password		| if set, remember the password for subsequent logins of this user.
+-remember-password		| if set, remember the password for subsequent logins of this user. (Use \"-username <username> -remember-password\" as login credentials)
 -dir \<installdir>		| the directory in which to place downloaded files.
 -filelist \<file.txt>	| a list of files to download (from the manifest). Prefix file path with `regex:` if you want to match with regex.
 -validate				| Include checksum verification of files already downloaded