exit: add page

pages/windows/exit.md

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+# exit
+
+> Quit the current CMD instance or the current batch file.
+
+- Quit the current CMD instance:
+
+`exit`
+
+- Quit the current batch script:
+
+`exit /b`
+
+- Quit using a specific exit code:
+
+`exit {{exit_code}}`