Add rust kext to the mono repo

windows_kext/release/README.md

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+# Kext release tool
+
+### Generate the zip file
+- Make sure `kext_interface/version.txt` is up to date
+- Execute: `cargo run`  
+  * This will generate release `kext_release_vX-X-X.zip` file. Which contains all the necessary files to make the release.  
+
+### Generate the cab file
+- Copy the zip and extract it on a windows machine.
+  * Some version Visual Studio needs to be installed.
+- From VS Command Prompt / PowerShell run:
+```
+cd kext_release_v.../
+./build_cab.bat
+```
+
+3. Sing the cab file
+
+### Let Microsoft Sign
+- Go to https://partner.microsoft.com/en-us/dashboard/hardware/driver/New
+- Enter "PortmasterKext vX.X.X #1" as the product name
+- Upload `portmaster-kext_vX-X-X.cab`
+- Select the Windows 10 versions that you compiled and tested on
+- Wait for the process to finish, download the `.zip`.
+
+The zip will contain the release files.  
+> Optionally sign the .sys file.