[Design]: add code of conduct file

[LeDuble]

Prerequisites

• I have read the Git Etiquette. (Required)
• I agree to follow the Code of Conduct. (Required)
• Are you intending to include tests? (Optional)

Summary (Required)

code of conduct file is needed for the issue forms so when clicked, it directs to the right path/file.

Potential Solution (Required)

adding dummy code of conduct for now and adding text in to it later

Media (Optional)

No response

In which category does the issue belong? (Required)

Add ➕ - Adding essentials to the repository (e.g. .gitignore or example files).