fdesetup: add page (#4011)

pages/osx/fdesetup.md

@@ -0,0 +1,23 @@
+# fdesetup
+
+> Set and retrieve FileVault related information.
+
+- List current FileVault enabled users:
+
+`sudo fdesetup list`
+
+- Get current FileVault status:
+
+`fdesetup status`
+
+- Add FileVault enabled user:
+
+`sudo fdesetup add -usertoadd user1`
+
+- Enable FileVault:
+
+`sudo fdesetup enable`
+
+- Disable FileVault:
+
+`sudo fdesetup disable`