Create CODE_OF_CONDUCT.md

[Lucyeoh]

I looked at your project and it looks really interesting but I couldn't find a code of conduct so I added a code of conduct from Contributor Covenant, I took a guess at the contact information [williamschidi1@gmail.com] from your personal profile but feel free to change it.

[raivisdejus]

Thanks, so far people have been behaving quite civilized here, but extra reminders can't hurt.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.46%. Comparing base (4d9547d) to head (c9f75c4). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #896 +/- ## ======================================= Coverage 82.46% 82.46% ======================================= Files 85 85 Lines 4682 4682 ======================================= Hits 3861 3861 Misses 821 821 ``` | [Flag](https://app.codecov.io/gh/chidiwilliams/buzz/pull/896/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chidi+Williams) | Coverage Δ | | |---|---|---| | [Linux](https://app.codecov.io/gh/chidiwilliams/buzz/pull/896/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chidi+Williams) | `82.16% <ø> (+0.04%)` | :arrow_up: | | [macOS](https://app.codecov.io/gh/chidiwilliams/buzz/pull/896/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chidi+Williams) | `82.33% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chidi+Williams#carryforward-flags-in-the-pull-request-comment) to find out more.

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