Initial simple manager

[codecov[bot]]

Codecov Report

Attention: 50 lines in your changes are missing coverage. Please review.

Comparison is base (6e3791a) 78.50% compared to head (7c71aab) 77.50%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #390 +/- ## ========================================== - Coverage 78.50% 77.50% -1.01% ========================================== Files 34 35 +1 Lines 4062 4112 +50 Branches 638 640 +2 ========================================== - Hits 3189 3187 -2 - Misses 629 680 +51 - Partials 244 245 +1 ``` | [Files](https://app.codecov.io/gh/SCALE-MS/scale-ms/pull/390?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SCALE-MS) | Coverage Δ | | |---|---|---| | [src/scalems/simple/\_\_init\_\_.py](https://app.codecov.io/gh/SCALE-MS/scale-ms/pull/390?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SCALE-MS#diff-c3JjL3NjYWxlbXMvc2ltcGxlL19faW5pdF9fLnB5) | `0.00% <0.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/SCALE-MS/scale-ms/pull/390/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SCALE-MS)

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