Create a feature comparison table in the docs

[codecov[bot]]

Codecov Report

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

Project coverage is 75.31%. Comparing base (4d1b767) to head (e83398e). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #85 +/- ## ======================================= Coverage 75.31% 75.31% ======================================= Files 119 119 Lines 7041 7041 Branches 982 982 ======================================= Hits 5303 5303 Misses 1430 1430 Partials 308 308 ``` | [Flag](https://app.codecov.io/gh/AArnott/Nerdbank.MessagePack/pull/85/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrew+Arnott) | Coverage Δ | | |---|---|---| | [Linux](https://app.codecov.io/gh/AArnott/Nerdbank.MessagePack/pull/85/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrew+Arnott) | `75.31% <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=Andrew+Arnott#carryforward-flags-in-the-pull-request-comment) to find out more.

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