add linux tool

linux/Makefile

@@ -0,0 +1,22 @@
+TARGET = twiboot
+
+CFLAGS = -Wall -Wno-unused-result -O2 -MMD -MP -MF $(*F).d
+
+# ------
+
+SRC := $(wildcard *.c)
+
+all: $(TARGET)
+
+$(TARGET): $(SRC:.c=.o)
+	@echo " Linking file:  $@"
+	@$(CC) $(CFLAGS) $^ -o $@ $(LDFLAGS) > /dev/null
+
+%.o: %.c
+	@echo " Building file: $<"
+	@$(CC) -c $(CFLAGS) $< -o $@
+
+clean:
+	rm -rf $(TARGET) *.o *.d
+
+-include $(shell find . -name \*.d 2> /dev/null)