add snake example game

Makefile

@@ -1,11 +1,12 @@
 CC := gcc
 LIBS := `pkg-config --libs sdl3`
 INC := `pkg-config --cflags sdl3` -I./include
-SRC := src/main.c \
-	src/engine/engine.c \
+SRC := src/engine/engine.c \
 	src/engine/engine_init.c \
 	src/engine/render.c
 OUT := build/main
+SNAKE_SRC := src/examples/snake.c $(SRC)
+SNAKE := build/snake
 
 build:
 	$(CC) -o $(OUT) $(SRC) $(INC) $(LIBS)
@@ -13,6 +14,15 @@ build:
 run:
 	$(OUT)
 
+build-snake:
+	$(CC) -o $(SNAKE) $(SNAKE_SRC) $(INC) $(LIBS)
+
+run-snake:
+	$(SNAKE)
+
+clean-snake:
+	rm $(SNAKE)
+
 clean:
 	rm $(OUT)