Added Invoke-RunAsPowerShell7 function to repo 🛰

Invoke-RunAsPowerShell7/Invoke-RunAsPowerShell7.ps1

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+function Invoke-RunAsPowerShell7 {
+<#
+.Synopsis
+Run a command in PowerShell 7
+
+.DESCRIPTION
+Downloads PowerShell 7 from GitHub, expands the archive and runs the specified command in PowerShell 7
+
+.NOTES   
+Name: Invoke-RunAsPowerShell7
+Author: Jaap Brasser
+Version: 1.0
+DateUpdated: 2020-05-24
+
+.LINK
+https://www.jaapbrasser.com
+
+.EXAMPLE
+Invoke-RunAsPowerShell7 -Command '$PSVersionTable'
+
+Description:
+Downloads PowerShell 7 from GitHub, expands the archive and runs the specified command in PowerShell 7
+#>
+    param(
+        # The command that will be run in PowerShell 7
+        [string] $Command
+    )
+
+    [Net.ServicePointManager]::SecurityProtocol = ([Net.ServicePointManager]::SecurityProtocol).tostring() + ', Tls12'
+    Invoke-WebRequest https://github.com/PowerShell/PowerShell/releases/download/v7.0.1/PowerShell-7.0.1-win-x64.zip -OutFile $env:temp\pwsh.zip
+    $GUID = (New-Guid).Guid
+    Expand-Archive $env:temp\pwsh.zip -DestinationPath $env:temp\$guid
+    & "$env:temp\$guid\pwsh.exe" -c $Command
+}