update README.md

- A maximum SLOC can't be reasonably determined before implementing the
missing protocols, so not any time soon

- dwl definitely isn't a simple as dwm since it must implement lots of
Wayland protocols and not just manage windows. The status bar
integration, layer shell popups, damage tracking and IME are gonna
require hundreds more lines each.

- "Buffering of input when spawning a client so you don't have to wait
for the window (use `wl_client_get_credentials` to get the PID) - would
this require passing through something like dmenu?  Extension protocol?"
This sounds exoteric, if anything this should be patch.

- Can dwl really be started from within an X session? When I do it from
dwm it crashes.

- A window's texture is scaled for its "home" monitor only (noticeable
when window sits across a monitor boundary)
Gonna open a ticket for this rather than keep it in the README.

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