wiki: Add Workspaces page

wiki/Workspaces.md

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+### Overview
+
+Niri has dynamic workspaces that can move between monitors.
+
+Each monitor contains an independent set of workspaces arranged vertically.
+You can switch between workspaces on a monitor with `focus-workspace-down` and `focus-workspace-up`.
+Empty workspaces "in the middle" automatically disappear when you switch away from them.
+
+There's always one empty workspace at the end (at the bottom) of every monitor.
+When you open a window on this empty workspace, a new empty workspace will immediately appear further below it.
+
+You can move workspaces up and down on the monitor with `move-workspace-up/down`.
+The way to put a window on a new workspace "in the middle" is to put it on the last (empty) workspace, then move the workspace up to where you need.
+
+Here's a visual representation that shows two monitors and their workspaces.
+The left monitor has three workspaces (two with windows, plus one empty), and the right monitor has two workspaces (one with windows, plus one empty).
+
+<picture>
+    <source media="(prefers-color-scheme: dark)" srcset="./img/workspaces-dark.png">
+    <img alt="Two monitors. First with three workspaces, second with two workspaces." src="./img/workspaces-light.png">
+</picture>
+
+You can move a workspace to a different monitor using binds like `move-workspace-to-monitor-left/right/up/down` and `move-workspace-to-monitor-next/previous`.
+
+When you disconnect a monitor, its workspaces will automatically move to a different monitor.
+But, they will also "remember" their original monitor, so when you reconnect it, the workspaces will automatically move back to it.
+
+> [!TIP]
+> From other tiling WMs, you may be used to thinking about workspaces like this: "These are all of my workspaces. I can show workspace X on my first monitor, and workspace Y on my second monitor."
+> In niri, instead, think like this: "My first monitor contains these workspaces, including X and Y, and my second monitor contains these other workspaces. I can switch my first monitor to workspace X or Y. I can move workspace Y to my second monitor to show it there."
+
+### Addressing workspaces by index
+
+Several actions in niri can address workspaces "by index": `focus-workspace 2`, `move-column-to-workspace 4`.
+This index refers to whichever workspace *currently happens to be* at this position on the focused monitor.
+So, `focus-workspace 2` will always put you on the second workspace of the monitor, whichever workspace that currently is.
+
+This is an important distinction from WMs with static workspace systems.
+In niri, workspaces *do not have indices on their own*.
+If you take the first workspace and move it further down on the monitor, `focus-workspace 1` will now put you on a different workspace (the one that was below the first workspace before you moved it).
+
+When you want to have a more permanent workspace in niri, you can create a [named workspace](./Configuration:-Named-Workspaces.md) in the config.
+You can refer to named workspaces by name, e.g. `focus-workspace "browser"`, and they won't disappear when they become empty.
+
+> [!TIP]
+> You can try to emulate static workspaces by creating workspaces named "one", "two", "three", ..., and binding keys to `focus-workspace "one"`, `focus-workspace "two"`, ...
+> This can work to some extent, but it can become somewhat confusing, since you can still move these workspaces up and down and between monitors.
+>
+> If you're coming from a static workspace WM, I suggest *not* doing that, but instead trying the "niri way" with dynamic workspaces, focusing and moving up/down instead of by index.
+> Thanks to scrollable tiling, you generally need fewer workspaces than on a traditional tiling WM.
+
+### Example workflow
+
+This is how I like to use workspaces.
+
+I will usually have my browser on the topmost workspace, then one workspace per project (or a "thing") I'm working on.
+On a single workspace I have 1–2 windows that fit inside a monitor that I switch between frequently, and maybe extra windows scrolled outside the view, usually either ones I need rarely, or temporary windows that I quickly close.
+When I need another permanent window, I'll put it on a new workspace.
+
+I actively move workspaces up and down as I'm working on things to make what I need accessible in one motion.
+For example, I usually frequently switch between the browser and whatever I'm doing, so I always move whatever I'm currently doing to right below the browser, so a single `focus-workspace-up/down` gets me where I want.

wiki/_Sidebar.md

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 * [Getting Started](./Getting-Started.md)
 * [Example systemd Setup](./Example-systemd-Setup.md)
 * [Important Software](./Important-Software.md)
+* [Workspaces](./Workspaces.md)
 * [Floating Windows](./Floating-Windows.md)
 * [Tabs](./Tabs.md)
 * [Screencasting](./Screencasting.md)

wiki/img/workspaces-dark.png

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wiki/img/workspaces-light.png

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