docs: Contributing to AIRYL

[RudraNilBasu]

Should contain:

• Header
• Author of the creator
• License
• Table of contents
  • Contributing guidelines (Basic rules)
  • Coding conventions
  • Commit message rules
  • Sending patches to maintainers

[RudraNilBasu]

Link to Coding style

[chowdhurySum]

https://pastebin.com/PVr5NQu5