Find class of given IPv4 address in Ruby

[bhawesh96]

Resolves Issue #88

Description

Write a Ruby script to find class of given IPv4 address

How to run

ruby ruby.rb

Checklist

• [x] Code compiles correctly.
• [x] Changes are tested properly.
• [x] Added the README / documentation, if necessary.
• [x] Followed the Contributing guidelines.
• [x] Resolved merge conflicts, if any.

[bhawesh96]

@krithikvaidya , requesting your review.