reg-copy: add page

pages/windows/reg-copy.md

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+# reg copy
+
+> Copy keys and their values in the registry.
+
+- Copy a registry key to a new registry location:
+
+`reg copy {{old_key_name}} {{new_key_name}}`
+
+- Copy a registry key recursively to a new registry location:
+
+`reg copy {{old_key_name}} {{new_key_name}} /s`
+
+- Forcefully copy a registry key without a prompt:
+
+`reg copy {{old_key_name}} {{new_key_name}} /f`