vlib: sdl module + tVintris example

vlib/sdl/README.md

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+# sdl
+SDL2 V module -- libSDL2 wrapper
+
+Current APIs available/tested in examples :
+- basic graphics (2D drawing)
+- [Image](image/README.md)
+- TTF font (text rendering)
+- input handling (keyboard/joystick events)
+- sounds (WAV mixing)
+- music (MOD mixing)
+- more to come.. (networking ?)
+
+# Support
+sdl is supported on :
+- linux (major distros)
+- MacOS (brew)
+- windows (msys2/mingw64 only for now)
+
+# Examples
+
+[tVintris](examples/tvintris)
+
+![tVintris screenshot](examples/tvintris/images/tvintris.png)
+
+You can run the tVintris example from the V root folder like this :
+```
+v run vlib/sdl/examples/tvintris/tvintris.v
+```
+
+# Dependencies
+
+## Linux
+Fedora :
+`$ sudo dnf install SDL2-devel SDL2_ttf-devel SDL2_mixer-devel SDL2_image-devel`
+
+Ubuntu :
+`$ sudo apt install libsdl2-ttf-dev libsdl2-mixer-dev libsdl2-image-dev`
+
+ClearLinux :
+`$ sudo swupd bundle-add devpkg-SDL2_ttf devpkg-SDL2_mixer devpkg-SDL2_image`
+
+## MacOS
+Brew :
+`$ brew install sdl2 sdl2_gfx sdl2_ttf sdl2_mixer sdl2_image sdl2_net`
+
+## Windows
+Windows/MSYS2 :
+`$ pacman -S mingw-w64-x86_64-SDL2_ttf mingw-w64-x86_64-SDL2_mixer mingw-w64-x86_64-SDL2_image`
+
+# Contributions
+
+nsauzede
+spytheman
+adlesh