Add CONTRIBUTING.md file with contribution guidelines

Update Makefile

Add files via upload

Update terminall to terminal

Update novabootmanager.c

Update novabootmanager.c

Update README.md

Delete nova-os-2.0/boot.sh

Update and rename icon-converter.sh to boot.sh

Create icon-converter.sh

Create boot.sh

Add files via upload

Update novabootmanager.c

Update novabootmanager.c

Create nova-os-2.0/novabootmanager.c