Add Code of Conduct

[SandeepKrSuman]

• Create a CODE_OF_CONDUCT.md file in the root of this repo.
• Add guidelines and standard relevant to this project.

Resource : https://www.contributor-covenant.org/version/2/1/code_of_conduct/

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• This is a 'good first issue'. Someone who is new to contribution is preferred.
• Please leave this issue for beginners if you have already contributed.

[Valliammai-SM]

Please assign this to me

[SandeepKrSuman]

Hey @Valliammai-SM assigning this to you!