Help me add the Code of Conduct to this repo

[devcer]

• Create a CODE_OF_CONDUCT.md for this project
  I don't have a pre-decided template but would love to hear your recommendations on drafting a proper COC!

[slzakaria]

Hello, i could work on this if you can assign me please :)

[devcer]

@Zackaria-Slimane All the best!