set up game loop

game.odin

@@ -0,0 +1,27 @@
+package main
+
+import rl "vendor:raylib"
+
+Game :: struct {
+	running: bool,
+	time:    f32, // total time elapsed
+}
+
+game_init :: proc() -> Game {
+	return Game{running = true, time = 0}
+}
+
+game_update :: proc(g: ^Game, dt: f32) {
+	g.time += dt
+
+	if rl.IsKeyPressed(.ESCAPE) {
+		g.running = false
+	}
+}
+
+game_draw :: proc(g: ^Game) {
+	fps := rl.GetFPS()
+	rl.DrawText(rl.TextFormat("FPS: %i", fps), 10, 36, 20, rl.GREEN)
+	rl.DrawText(rl.TextFormat("Time: %.1fs", g.time), 10, 62, 20, rl.GRAY)
+}
+