Want a Matrix client that uses Vim keybindings (#1)

src/windows/welcome.md

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+# Welcome to iamb!
+
+## Useful Keybindings
+
+- `<Enter>` will send a typed message
+- `O`/`o` can be used to insert blank lines before and after the cursor line
+- `^O` can be used in Insert mode to enter a single Normal mode keybinding sequence
+- `^Wm` can be used to toggle whether the message bar or scrollback is selected
+- `^Wz` can be used to toggle whether the current window takes up the full screen
+
+## Room Commands
+
+- `:dms` will open a list of direct messages
+- `:rooms` will open a list of joined rooms
+- `:spaces` will open a list of joined spaces
+- `:join` can be used to switch to join a new room or start a direct message
+- `:split` and `:vsplit` can be used to open rooms in a new window
+
+## Verification Commands
+
+The `:verify` command has several different subcommands for working with
+verification requests. When used without any arguments, it will take you to a
+list of current verifications, where you can see and compare the Emoji.
+
+The different subcommands are:
+
+- `:verify request USERNAME` will send a verification request to a user
+- `:verify confirm USERNAME/DEVICE` will confirm a verification
+- `:verify mismatch USERNAME/DEVICE` will cancel a verification where the Emoji don't match
+- `:verify cancel USERNAME/DEVICE` will cancel a verification
+
+## Other Useful Commands
+
+- `:welcome` will take you back to this screen
+
+## Additional Configuration
+
+You can customize iamb in your `$CONFIG_DIR/iamb/config.json` file, where
+`$CONFIG_DIR` is your system's per-user configuration directory.
+
+You can edit the following values in the file:
+
+- `"default_profile"`, a profile name to use when starting iamb if one wasn't specified
+- `"cache"`, a directory for cached iamb