Add Remove-SignalFiles script and scripts readme

Author: golf1052

scripts/README.md

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+# Scripts
+
+## Remove-SignalFiles
+
+Deletes all database, log, and attachment files in LocalCache.

scripts/Remove-SignalFiles.ps1

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+function Remove-SignalFiles {
+    [CmdletBinding(
+        SupportsShouldProcess,
+        ConfirmImpact = "High"
+    )]
+    param (
+        [Switch]$Force
+    )
+
+    if ($Force -and -not $Confirm) {
+        $ConfirmPreference = "None"
+    }
+
+    $localCachePath = "$env:LOCALAPPDATA/Packages/2383BenediktRadtke.SignalPrivateMessenger_teak1p7hcx9ga/LocalCache"
+    if ($PSCmdlet.ShouldProcess($localCachePath, "Delete databases, logs, and attachments")) {
+        Remove-Item -Recurse -Force "$localCachePath/*"
+        Write-Host "Removed items"
+    }
+}
+
+Remove-SignalFiles