set: add page

pages/windows/set.md

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+# set
+
+> Display or set environment variables for the current instance of CMD.
+
+- List all current environment variables:
+
+`set`
+
+- Set an environment variable to a specific value:
+
+`set {{name}}={{value}}`
+
+- List environment variables starting with the specified string:
+
+`set {{name}}`
+
+- Prompt the user for a value for the specified variable:
+
+`set /p {{name}}={{prompt_string}}`