moved examples

examples/hello_world/main.rs

@@ -0,0 +1,16 @@
+use gsa::{run, Gsa};
+
+struct Game {}
+
+fn init(gsa: &mut Gsa) -> Game {
+    //game initialisation code
+    gsa.sprites[0].tile = 0;
+    Game {}
+}
+
+fn update(game: &mut Game, gsa: &mut Gsa) {
+    gsa.sprites[0].pos += gsa.input_dir();
+    //once per frame code
+}
+
+run!(init, update);