Update README usage info to match usage print output.

README.md

@@ -4,27 +4,35 @@ DepotDownloader
 Steam depot downloader utilizing the SteamKit2 library. Supports .NET Core 2.0
 
 ```
-Usage: ./depotdownloader <parameters> [optional parameters]
+Usage - downloading one or all depots for an app:
-OR: dotnet DepotDownloader.dll <parameters> [optional parameters]
+	dotnet DepotDownloader.dll -app <id> [-depot <id> [-manifest <id>] | [-ugc <id>]]
+		[-username <username> [-password <password>]] [other options]
+
+Usage - downloading a Workshop item published via SteamUGC
+	dotnet DepotDownloader.dll -pubfile <id> [-username <username> [-password <password>]]
 
 Parameters:
-  -app <#>               - the AppID to download.
+	-app <#>				- the AppID to download.
-
+	-depot <#>				- the DepotID to download.
-Optional Parameters:
+	-manifest <id>			- manifest id of content to download (requires -depot, default: current for branch).
-  -depot <#>             - the DepotID to download.
+	-ugc <#>				- the UGC ID to download.
-  -cellid <#>            - the overridden CellID of the content server to download from.
+	-beta <branchname>		- download from specified branch if available (default: Public).
-  -username <user>       - the username of the account to login to for restricted content.
+	-betapassword <pass>	- branch password if applicable.
-  -password <pass>       - the password of the account to login to for restricted content.
+	-all-platforms			- downloads all platform-specific depots when -app is used.
-  -remember-password     - if set, remember the password for subsequent logins of this user.
+	-os <os>				- the operating system for which to download the game (windows, macos or linux, default: OS the program is currently running on)
-  -dir <installdir>      - the directory in which to place downloaded files.
+
-  -os <os>               - the operating system for which to download the game (windows, macos or linux, default: OS the program is currently running on)
+	-pubfile <#>			- the PublishedFileId to download. (Will automatically resolve to UGC id)
-  -filelist <file.txt>   - a list of files to download (from the manifest).
+
-                           Can optionally use regex to download only certain files.
+	-username <user>		- the username of the account to login to for restricted content.
-  -all-platforms         - downloads all platform-specific depots when -app is used.
+	-password <pass>		- the password of the account to login to for restricted content.
-  -manifest-only         - downloads a human readable manifest for any depots that would be downloaded.
+	-remember-password		- if set, remember the password for subsequent logins of this user.
-  -beta <branchname>     - download from specified branch if available (default: Public).
+
-  -betapassword <pass>   - branch password if applicable.
+	-dir <installdir>		- the directory in which to place downloaded files.
-  -manifest <id>         - manifest id of content to download (requires -depot, default: latest for branch).
+	-filelist <file.txt>	- a list of files to download (from the manifest). Can optionally use regex to download only certain files.
-  -max-servers <#>       - maximum number of content servers to use. (default: 8).
+	-validate				- Include checksum verification of files already downloaded
-  -max-downloads <#>     - maximum number of chunks to download concurrently. (default: 4).
+
+	-manifest-only			- downloads a human readable manifest for any depots that would be downloaded.
+	-cellid <#>				- the overridden CellID of the content server to download from.
+	-max-servers <#>		- maximum number of content servers to use. (default: 8).
+	-max-downloads <#>		- maximum number of chunks to download concurrently. (default: 4).
 ```