Added an installer for odin.

odin.ps1

@@ -0,0 +1,124 @@
+function Test-WinUtilPackageManager {
+    <#
+
+    .SYNOPSIS
+        Checks if Winget is installed
+
+    .PARAMETER winget
+        Check if Winget is installed
+
+    #>
+
+    Param(
+        [System.Management.Automation.SwitchParameter]$winget
+    )
+
+    $status = "not-installed"
+
+    if ($winget) {
+        # Check if Winget is available while getting it's Version if it's available
+        $wingetExists = $true
+        try {
+            $wingetVersionFull = winget --version
+        } catch [System.Management.Automation.CommandNotFoundException], [System.Management.Automation.ApplicationFailedException] {
+            Write-Warning "Winget was not found due to un-availablity reasons"
+            $wingetExists = $false
+        } catch {
+            Write-Warning "Winget was not found due to un-known reasons, The Stack Trace is:`n$($psitem.Exception.StackTrace)"
+            $wingetExists = $false
+	}
+
+        # If Winget is available, Parse it's Version and give proper information to Terminal Output.
+	# If it isn't available, the return of this funtion will be "not-installed", indicating that
+        # Winget isn't installed/available on The System.
+	if ($wingetExists) {
+            # Check if Preview Version
+            if ($wingetVersionFull.Contains("-preview")) {
+                $wingetVersion = $wingetVersionFull.Trim("-preview")
+                $wingetPreview = $true
+            } else {
+                $wingetVersion = $wingetVersionFull
+                $wingetPreview = $false
+            }
+
+            # Check if Winget's Version is too old.
+            $wingetCurrentVersion = [System.Version]::Parse($wingetVersion.Trim('v'))
+            # Grabs the latest release of Winget from the Github API for version check process.
+            $response = Invoke-RestMethod -Uri "https://api.github.com/repos/microsoft/Winget-cli/releases/latest" -Method Get -ErrorAction Stop
+            $wingetLatestVersion = [System.Version]::Parse(($response.tag_name).Trim('v')) #Stores version number of latest release.
+            $wingetOutdated = $wingetCurrentVersion -lt $wingetLatestVersion
+            Write-Host "===========================================" -ForegroundColor Green
+            Write-Host "---        Winget is installed          ---" -ForegroundColor Green
+            Write-Host "===========================================" -ForegroundColor Green
+            Write-Host "Version: $wingetVersionFull" -ForegroundColor White
+
+            if (!$wingetPreview) {
+                Write-Host "    - Winget is a release version." -ForegroundColor Green
+            } else {
+                Write-Host "    - Winget is a preview version. Unexpected problems may occur." -ForegroundColor Yellow
+            }
+
+            if (!$wingetOutdated) {
+                Write-Host "    - Winget is Up to Date" -ForegroundColor Green
+                $status = "installed"
+            }
+            else {
+                Write-Host "    - Winget is Out of Date" -ForegroundColor Red
+                $status = "outdated"
+            }
+        } else {
+            Write-Host "===========================================" -ForegroundColor Red
+            Write-Host "---      Winget is not installed        ---" -ForegroundColor Red
+            Write-Host "===========================================" -ForegroundColor Red
+            $status = "not-installed"
+        }
+    }
+
+    return $status
+}
+
+function ConfirmBaseRun {
+  $isWingetInstalled = Test-WinUtilPackageManager -winget
+
+  if (!($isWingetInstalled -eq "installed")) {
+    Write-Warning "!!! Winget is not installed."
+
+    Write-Host "You haven't run the base.ps1 script yet. Please visit https://learncodethehardway.com/setup/installers.html for more."
+
+    Exit
+  }
+}
+
+ConfirmBaseRun
+
+$odinPath = $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath("$env:APPDATA\..\Local\Programs\Odin")
+
+if(Test-Path -Path $odinPath) {
+  Write-Warning "#=========================================================#"
+  Write-Warning "!! The directory $odinPath already exists, which means"
+  Write-Warning "!! you already have odin installed.  Here's the version:"
+  cat "$odinPath\mingw64\version_info.txt"
+  Write-Warning "#=========================================================#"
+  Write-Warning "Here's the version that Winget will install:"
+  winget search odin-lang.Odin
+  Write-Warning "--- If you want me to replace your install with this version, then stop and"
+  Write-Warning "delete the $odinPath directory before hitting ENTER to continue."
+  Write-Warning "!!! If you do NOT want to replace this directory then hit CTRL-C now."
+  Read-Host -Prompt "Press any key to continue, or CTRL-C to abort" | Out-Null
+}
+
+Write-Warning "!! Installing Odin in $odinPath"
+Write-Warning "This has to be installed this way because winget won't add it to the path so I have to do it manually. If you don't want this, then hit CTRL-C and install Odin yourself."
+Read-Host -Prompt "Press any key to continue, or CTRL-C to abort" | Out-Null
+
+winget install --location "$odinPath" -e odin-lang.Odin
+
+if($env:PATH.contains($odinPath)) {
+  Write-Warning "!! Detected $odinPath in your PATH.  Will not update your PATH."
+  Write-Warning "!! This is probably because you already installed it. You'll have"
+  Write-Warning "!! to manually remove this part of your path if you want to change it."
+  Write-Warning "!! But, it will probably still work since that's where I installed it."
+} else {
+  $newPath = $env:PATH + ";$odinPath"
+  [Environment]::SetEnvironmentVariable("Path", $newPath, "User")
+}