Homework-2, Homework-3, Homework-4 re commited.

because of dummpy use of git i have to do that.
Merge branch 'master' of https://github.com/1995parham/os-homework

Conflicts:
	Homework-4/1
	Homework-4/1.c
	Homework-4/1.o
	Homework-4/Makefile
	Homework-4/os_assigment4_group20.tgz