lib/sdl2: add README

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/sdl2/README.md b/lib/sdl2/README.md
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+This is a low-level wrapper of the SDL 2.0 library (as `sdl2`) and SDL_image 2.0 (as `sdl2::image`).
+
+The main entry point of this project, `sdl2`, exposes some features of the base
+library: video, events, syswm, etc. The alternative entry point `sdl2::image` offers
+mainly `SDLSurface::load` to load images from PNG, JPG or TIF files.
+
+You can also import `sdl2::all` to get `sdl2` and all its sister libraries, which is only
+`sdl2::image` at this point.
+
+# Examples
+
+See the `minimal` example within this project at `examples/minimal` for a simple example
+of how to use this project.