Update: Centos.md

Update: MS DOS.md

Update: Centos.md

Update: Centos.md

Update: Centos.md

Update: MS DOS.md, Windows.md

create: ИТ.md

create: Centos.md, Windows.md, delete: Centos.md, Windows.md

create: Centos.md, Windows.md

delete: Centos7.md

update: MS DOS.md