readme: convert to Markdown

Gives us nice links and code blocks.

Signed-off-by: Simon Ser <contact@emersion.fr>

README.md

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+# Wayland
+
+Wayland is a project to define a protocol for a compositor to talk to
+its clients as well as a library implementation of the protocol.  The
+compositor can be a standalone display server running on Linux kernel
+modesetting and evdev input devices, an X application, or a wayland
+client itself.  The clients can be traditional applications, X servers
+(rootless or fullscreen) or other display servers.
+
+The wayland protocol is essentially only about input handling and
+buffer management.  The compositor receives input events and forwards
+them to the relevant client.  The clients creates buffers and renders
+into them and notifies the compositor when it needs to redraw.  The
+protocol also handles drag and drop, selections, window management and
+other interactions that must go through the compositor.  However, the
+protocol does not handle rendering, which is one of the features that
+makes wayland so simple.  All clients are expected to handle rendering
+themselves, typically through cairo or OpenGL.
+
+Building the wayland libraries is fairly simple, aside from libffi,
+they don't have many dependencies:
+
+    $ git clone https://gitlab.freedesktop.org/wayland/wayland
+    $ cd wayland
+    $ meson build/ --prefix=PREFIX
+    $ ninja -C build/ install
+
+where PREFIX is where you want to install the libraries.
+
+See https://wayland.freedesktop.org for documentation.