docs: add contribution guidelines

[fivenp]

Pull request description

Adding basic contribution + code of conduct guidelines

Before

• No guidelines

After

• Some guidelines...

Checklist (choose what happened)

• [ ] breaking change! (describe)
• [x] tested locally
• [x] updated the docs
• [ ] added a test

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Name	Status	Preview	Updated
contribute-design	🔄 Building (Inspect)		Nov 25, 2022 at 8:14PM (UTC)