reg-add: add page

pages/windows/reg-add.md

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+# reg add
+
+> Add new keys and their values to the registry.
+
+- Add a new registry key:
+
+`reg add {{key_name}}`
+
+- Add a new value under a specific key:
+
+`reg add {{key_name}} /v {{value}}`
+
+- Add a new value with specific data:
+
+`reg add {{key_name}} /d {{data}}`
+
+- Add a new value to a key with a specific data type:
+
+`reg add {{key_name}} /t {{type}}`
+
+- Forcefully overwrite the existing registry value without a prompt:
+
+`reg add {{key_name}} /f`