add PCM package and download details to metadata

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -29,7 +29,7 @@ Copy the contents of `plugins/` into your KiCad scripting plugins directory:
 
 ### KiCad PCM
 
-Coming soon.
+Search for "STM32 Pin Validator" in KiCad's Plugin and Content Manager.
 
 ## Usage
 

metadata.json

@@ -16,7 +16,11 @@
     {
       "version": "1.0.0",
       "status": "stable",
-      "kicad_version": "9.0"
+      "kicad_version": "9.0",
+      "download_url": "https://git.b4l.co.th/jamork/stm32PinValidator/releases/download/v1.0.0/stm32-pin-validator-1.0.0.zip",
+      "download_sha256": "78350f165331c98d5c1771fba5d1ce0ebfa214f75b54ec1ae2965e1d4c0483c2",
+      "download_size": 10417,
+      "install_size": 28000
     }
   ]
 }