Added commentary to setup script

Author: unalignedcoder

CalibreImport/Setup.ps1

@@ -64,6 +64,7 @@ function Unregister-Dll {
     }
 }
 
+# full list of Calibre-supported extensions from the registry
 function GetCalibreExtensions {
     $calibreAssocKey = "HKCU:\SOFTWARE\calibre\calibre64bit\Capabilities\FileAssociations"
     if (Test-Path $calibreAssocKey) {
@@ -75,6 +76,8 @@ function GetCalibreExtensions {
     }
 }
 
+<# adding registry entries for all Calibre-supported extensions
+this is redundant, since the C# code already takes care of this upon registration #>
 function Add-RegistryEntries {
     $extensions = GetCalibreExtensions
     $guid = "8E5CD5CA-64E0-479A-B62F-B1FC00FF0227"
@@ -89,6 +92,8 @@ function Add-RegistryEntries {
     }
 }
 
+<# removing registry entries for all Calibre-supported extensions
+this is redundant, since the C# code already takes care of this upon unregistration #>
 function Remove-RegistryEntries {
     $extensions = GetCalibreExtensions
 
@@ -101,12 +106,14 @@ function Remove-RegistryEntries {
     }
 }
 
+# optional
 function Restart-Explorer {
     Stop-Process -Name explorer -Force
     Start-Process explorer
     Log "Explorer restarted"
 }
 
+# verify whether the dll registration went through successfully
 function Check-DllRegistration {
     param (
         [string]$dllPath
@@ -134,6 +141,7 @@ if (-not $dllFiles) {
     throw "No DLLs found in the script directory."
 }
 
+# main script logic
 if ($i -or (-not $u -and -not $re)) {
     foreach ($dllFile in $dllFiles) {
         $dllPath = $dllFile.FullName