Readme- Improve binary file image verification script on the Windows Platform

README.md

@@ -204,12 +204,26 @@ shasum -a 256 --ignore-missing --check seedsigner.0.6.*.sha256
 
 **On Windows (inside Powershell):** Run this command
 ```
-CertUtil -hashfile  seedsigner_os.0.6.0.Insert_Your_Pi_Models_binary_here_For_Example_pi02w.img SHA256 
+<# 
+Read the contents of the manifest file (seedsigner.0.6.0.sha256) and
+loop through each line to check 
+if the computed hash matches the expected hash.#>
+Get-Content seedsigner.0.6.0.sha256 | ForEach-Object {
+
+    # Split each line to extract the binary filename and its expected hash.
+    $hash, $filename = $_ -Split '  ' 
+
+    # Check if the binary file exists, 
+    if ((Test-Path $filename) -eq $True) {
+
+        # check if the computed hash matches the expected hash
+        write-host $filename ('FAILED: Computed checksum did NOT match!', 'is OK.')[((Get-FileHash $filename).hash -eq $hash)]
+    }     
+} <#Press Enter to begin the hash verification.#>
 ```
-On Windows, you must then manually compare the resulting file hash value to the corresponding hash value shown inside the .SHA256 cleartext file.
  <BR>
 
-Wait up to 30 seconds for the command to complete, and it should display:
+When the OSX/Linux/Windows command completes it should display:
 ```
 seedsigner_os.0.6.x.[Your_Pi_Model_For_Example:pi02w].img: OK
 ```