wiki: Add gestures page

wiki/Gestures.md

@@ -0,0 +1,31 @@
+### Overview
+
+There are several gestures in niri.
+
+### Mouse
+
+#### Interactive Resize
+
+You can resize windows by holding <kbd>Mod</kbd> and the right mouse button.
+
+#### Reset Window Height
+
+If you double-click on a top or bottom window resize edge, the window height will reset to automatic.
+
+This works with both window-initiated resizes (when using client-side decorations), and niri-initiated <kbd>Mod</kbd> + right click resizes.
+
+#### Toggle Full Width
+
+If you double-click on a left or right window resize edge, the column will expand to the full workspace width.
+
+This works with both window-initiated resizes (when using client-side decorations), and niri-initiated <kbd>Mod</kbd> + right click resizes.
+
+### Touchpad
+
+#### Workspace Switch
+
+Switch workspaces with three-finger vertical swipes.
+
+#### Horizontal View Movement
+
+Move the view horizontally with three-finger horizontal swipes.

wiki/_Sidebar.md

@@ -6,6 +6,7 @@
 * [`niri msg`](./IPC.md)
 * [VSCode, Chromium, WezTerm](./Application-Issues.md)
 * [Xwayland](./Xwayland.md)
+* [Gestures](./Gestures.md)
 * [FAQ](./FAQ.md)
 
 ## Configuration