Add release badges and update Python classifiers

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (a2c1804) 78.92% compared to head (17f78f4) 78.92%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #13 +/- ## ======================================= Coverage 78.92% 78.92% ======================================= Files 6 6 Lines 204 204 ======================================= Hits 161 161 Misses 43 43 ```

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