add usblayout command for wii (nh-server#1319)

cogs/assistance-cmds/usblayout.wii.md

@@ -0,0 +1,27 @@
+---
+title: Wii USB drive layout
+help-desc: A quick overview on the USB drive layout for Wii and GameCube games
+---
+
+The file structure of your USB drive should look like this:
+
+```
+💾 SD or USB HDD:
+┣ 📂 wbfs
+┃ ┣ 📂 GameName [gameID]
+┃ ┃ ┗ 📜 gameid.wbfs
+┃ ┣ 📂 GameName [gameID] -- This example is for split WBFS files. If your drive's file system is NTFS or your game is smaller than 4 GB, ignore it.
+┃ ┃ ┣ 📜 gameid.wbfs
+┃ ┃ ┗ 📜 gameid.wbf1
+┣ 📂 games
+┃ ┣ 📂 GameName [gameID]
+┃ ┃ ┗ 📜game.iso -- This is not a placeholder, the file, with its file extension, should literally be named "game.iso".
+┃ ┣ 📂 GameName [gameID] -- This example is for games with multiple discs.
+┃ ┃ ┣ 📜game.iso
+┃ ┃ ┗ 📜disc2.iso
+```
+
+You can also use [Wii Backup Manager](https://wii.hacks.guide/wii-backups#using-wii-backup-manager) and [GameCube Backup Manager](https://wii.hacks.guide/gc-backups) to manage your backups.
+
+The `wbfs` folder is only for Wii games and the `games` folder is only for GameCube games.
+You can find the game IDs [here](https://www.gametdb.com).