genie: add page (#3224)

pages/linux/genie.md

@@ -0,0 +1,17 @@
+# genie
+
+> Set up and use a "bottle" namespace to run systemd under WSL (Windows Subsystem for Linux).
+> To run these from Windows rather than an already-running distribution, precede them with `wsl`.
+> More information: <https://github.com/arkane-systems/genie>.
+
+- Initialize the bottle (run once, at start):
+
+`genie -i`
+
+- Run a login shell inside the bottle:
+
+`genie -s`
+
+- Run a specified command inside the bottle:
+
+`genie -c {{command}}`