Added README-Wayland.md to explain some differences

Fixes issue #10

README-Wayland.md

@@ -0,0 +1,32 @@
+Wayland support is done and has been tested on KDE (Kwin) and weston.
+
+Limitations
+============
+
+Wayland works very differently than traditional desktops and imposes us some,
+limitations. Here's a list of different behaviours which KDDockWidgets will have
+when running on Wayland:
+
+
+- A title bar can either be used for drag&dock or for moving the window around.
+
+- For this reason, floating windows now have two title bars.
+  The native one, drawn by the server and the client one, drawn by KDDockWidgets.
+  The native one allows you to drag the window around but not drop/dock.
+  The client title bar allows you to perform a drag and drop/dock but not move the window around.
+
+- You can detach a window by:
+  - Clicking the title-bar's float button
+  - Double-clicking the title bar of a docked widget
+  - Double-clicking a tab
+
+- Layout save/restore won't restore the position of floating windows, as wayland
+  doesn't allow us to set geometry.
+
+- Kwin specific:
+  - The pixmap that's shown during a drag can't be bigger than 250x250. Might be a bug.
+
+
+
+All in all it's pretty decent and usable. Any further improvements should be done at the server or
+protocol level now.