Restrict package usage to Windows OS only

Author: DefinetlyNotAI

pyCTools/__init__.py

@@ -1,2 +1,6 @@
 from pyCTools.hwrng import MaxRNG
 from pyCTools.processInspect import ProcessMetrics
+
+import os
+if os.name != 'nt':
+    raise OSError('This package only supports Windows OS.')