added Makefile

Makefile

@@ -0,0 +1,16 @@
+.POSIX:
+
+NAME = example
+
+CFLAGS = -Wall -Wextra -Wpedantic -std=c90
+
+OBJ = $(NAME).o
+
+.PHONY: all
+all: $(NAME)
+
+.PHONY: clean
+clean:
+	rm -f $(NAME) $(OBJ)
+
+$(NAME): $(OBJ)