Add offline d2x IOS script for MacOS & Linux (#362)

* Add offline d2x IOS script for MacOS & Linux

* fix the file name, oops

_pages/en_US/cios.md

@@ -31,6 +31,9 @@ If your Wii has an Internet connection, you may skip this section. <br/>
 However, If you encounter any errors like `tcp_read timeout` and `net_gethostbyname failed:`, this will allow the Wii to skip the downloading step.
 {: .notice--warning}
 
+If you are not on Windows, you may download & run [this script](/assets/files/d2x_offline_ios.sh), and it will download the WAD files for you.
+{: .notice--info}
+
 1. Download, extract, and run [NUS Downloader](https://github.com/WiiDatabase/nusdownloader/releases/latest/download/NUSD-Mod-NUS-Fix.zip).
 1. Select "Database", "IOS", then "IOS38", and select "v4123".
    - Ensure that "Pack WAD" is checked.

assets/files/d2x_offline_ios.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+
+Sharpii_DL="https://noahpistilli.github.io/RC24_Patcher/Sharpii"
+case $(uname -m),$(uname) in
+ 	x86_64,Darwin|arm64,Darwin)
+ 		sys="macOS-x64";;
+	x86_64,*)
+		sys="linux-x64";;
+	aarch64,*)
+		sys="linux-arm64";;
+	*,*)
+		sys="linux-arm";;
+	x86_32,*)
+        	printf "The x86_32 architecture is not supported by Sharpii."
+    		exit;;
+esac
+
+download_ios () {
+	printf "Downloading IOS${1}...\r"
+	./Sharpii nusd -ios ${1} -v ${2} -wad -o ios/IOS${1}-64-v${2}.wad -q > /dev/null
+}
+
+if [[ -f "sharpii($sys)" ]]
+then
+	mv "sharpii($sys)" "Sharpii"
+fi
+
+if ! [[ -f "Sharpii" ]]
+then
+	if ! command -v curl &> /dev/null
+	then
+		echo >&2 $"Cannot find Sharpii nor curl to try download it.
+
+Either install curl with your package manager, or manually download it from $Sharpii_DL/sharpii($sys) ."
+		exit
+	else
+		curl -f -s -o "Sharpii" "$Sharpii_DL/sharpii($sys)"
+	fi
+	
+fi
+chmod +x Sharpii 2> /dev/null
+mkdir ios 2> /dev/null
+echo "This script downloads the 4 IOS WADs at wii.guide/cios mentioned at Section I."
+sleep 1
+download_ios 38 4123
+download_ios 56 5661
+download_ios 57 5918
+download_ios 58 6175
+echo "
+
+There should be an ios folder in $(pwd). 
+Move the four WAD files in it to the root of the device
+that contains the d2x-cIOS-installer."
+