Add PowerShell and sh scripts to clone/update content directory

support/UpdateContent.ps1

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+$ScriptDir = Split-Path $MyInvocation.MyCommand.Path -Parent
+$ScriptDir = Split-Path $ScriptDir -Parent
+Push-Location $ScriptDir
+if (-not (Test-Path "content"))
+{
+    git clone --depth 1 "https://github.com/CelestiaProject/CelestiaContent.git" -b master "content"
+}
+elseif (Test-Path "content" -PathType Container)
+{
+    Set-Location content
+    git fetch --depth 1 origin master
+    git reset --hard origin/master
+}
+else
+{
+    Write-Error "content exists and is not a directory"
+}
+
+Pop-Location

support/updatecontent.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+scripthome=$(dirname "$0" | while read a; do cd "$a" && pwd && break; done)
+oldpath=$(pwd)
+cd "$scripthome/.."
+
+if [ ! -e "content" ]
+then
+    git clone --depth 1 "https://github.com/CelestiaProject/CelestiaContent.git" -b master content
+elif [ -d "content" ]
+then
+    cd content
+    git fetch --depth 1 origin master
+    git reset --hard origin/master
+else
+    >&2 echo "content exists and is not a directory"
+fi
+
+cd "$oldpath"