setx: add page (#6734)

pages/windows/setx.md

@@ -0,0 +1,20 @@
+# setx
+
+> Sets persistent environment variables.
+> More information: <https://docs.microsoft.com/windows-server/administration/windows-commands/setx>.
+
+- Set an environment variable for the current user:
+
+`setx {{variable}} {{value}}`
+
+- Set an environment variable for the current machine:
+
+`setx {{variable}} {{value}} /M`
+
+- Set an environment variable for a user on a remote machine:
+
+`setx /s {{hostname}} /u {{username}} /p {{password}} {{variable}} {{value}}`
+
+- Set an environment variable from a registry key value:
+
+`setx {{variable}} /k {{registry\key\path}}`