Update cheatsheets

tldr/sway

@@ -0,0 +1,18 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# sway
+
+> A tiling Wayland compositor.
+> It uses the same config format as `i3`, with some Wayland-specific additions.
+> More information: <https://github.com/swaywm/sway/wiki>.
+
+- Start `sway`:
+
+`sway`
+
+- View documentation for `i3` (`sway` uses the same default keybindings):
+
+`tldr i3`