Add multithreading

Makefile

@@ -1,7 +1,8 @@
 FILES = *.c */*.c
-INCLUDES = -I. -I./parser/ -I./compiler -I./vm -I./tokenizer
+LIBRARIES = -lpthread
+INCLUDES = -I. -I./parser/ -I./compiler/ -I./vm/ -I./tokenizer/
 CFLAGS = -std=c99 -g
 OUTFILE = jack-compiler
 
 main: ${FILES}
-	${CC} ${CFLAGS} ${INCLUDES} -o ${OUTFILE} ${FILES}
+	${CC} ${CFLAGS} ${LIBRARIES} ${INCLUDES} -o ${OUTFILE} ${FILES}