Add README.md

README.md

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+# libscgui — Simple C++ SDL2-wrapper
+
+Rudimentary app and window support, with global and per-window event handling.
+
+## Build
+
+`make`
+
+after building and installing dependencies:
+
+- SDL2
+- SDL2_image
+
+## Install
+
+`sudo make install`
+
+or, on OpenBSD:
+
+`doas gmake install`
+
+## Documentation
+
+Not yet available.