Added installation script

[hoellwerth]

Installation script

• Added install.sh

  • Copies mcscanner.py file into /usr/bin
  • Gets the distro's package manager
  • installs masscan, python and pip
  • makes mcscanner globally executable
  • installs mcstatus via pip

• Updated README.md

  • Added new instructions on how to install and use

After installation, you can now use mcscanner instead of python /dictory/to/mcscanner.py