Document post/multi/screensaver

documentation/modules/post/multi/manage/screensaver.md

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+This module allows you to control the screensaver or lock the session.
+
+## Vulnerable Application
+
+The following platforms are supported:
+
+
+* Windows
+* Linux
+* OS X
+
+
+**WARNING**: only Linux supports stopping the screensaver.
+
+## Verification Steps
+
+1. Obtain a session.
+2. In msfconsole do `use post/multi/screensaver`.
+3. Set the `SESSION` option.
+4. Choose the action you want to perform via `set action NAME` (available actions described below).
+5. Do `run`.
+
+## Actions
+
+**LOCK**
+
+If you use `set action LOCK` the `run` command will lock the current session, the user will have to login again.
+
+**START**
+
+If you use `set action START` the `run` command will start the screensaver, depending on its settings the user may have to login again.
+
+**STOP**
+
+If you use `set action STOP` the `run` command will stop the screensaver.