Move Testing.md and create Style.md

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[codecov[bot]]

Codecov Report

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

Comparison is base (d23d289) 95.00% compared to head (d8ffbc6) 95.00%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #76 +/- ## ======================================= Coverage 95.00% 95.00% ======================================= Files 14 14 Lines 800 800 ======================================= Hits 760 760 Misses 40 40 ```

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