doc: added conduct and contributing guidelines

[codecov[bot]]

Codecov Report

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

Project coverage is 89.72%. Comparing base (b9e53af) to head (aaaf5c6).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #268 +/- ## ======================================= Coverage 89.72% 89.72% ======================================= Files 30 30 Lines 954 954 Branches 138 140 +2 ======================================= Hits 856 856 + Misses 98 96 -2 - Partials 0 2 +2 ```

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