Readme format change from rst to md

[JOTELLECHEA]

I converted the README.rst to README.md I add a contributors section towards the end similar to DecayLanguage repo. I don't which emoji to apply to each contributor. This is my first contribution to any open source project; any feedback would be great!

[JOTELLECHEA]

I converted the README.rst to README.md I add a contributors section towards the end similar to DecayLanguage repo. I don't know which emoji to apply to each contributor. This is my first contribution to any open source project; any feedback would be great!

[eduardo-rodrigues]

Hello @JOTELLECHEA, thank you for your interest in the package and your help improving the documentation! This conversion was a long wished thing, but it always got postponed.

Did you check that the rendering is fine and comprehensively replaces the present reST file?

It is indeed very important to acknowldedge contributions as done in many of the Scikit-HEP packages. The section is something I will take care of separately myself, as done in PR https://github.com/scikit-hep/decaylanguage/pull/272 and relatives for the DecayLanguage package. In that respect, remove the HTML table just leaving the placeholder section

## Contributors

We hereby acknowledge the contributors that made this project possible ([emoji key](https://allcontributors.org/docs/en/emoji-key)):

This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification.

and I will act in a follow-up PR.

[JOTELLECHEA]

Hello @eduardo-rodrigues, I removed the html table and have double check the README.md file rendering is fine and comprehensively replaces the present reST file. Do I need to submit a new PR?

[codecov-commenter]

Codecov Report

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

Comparison is base (7922cf6) 95.80% compared to head (48daef4) 95.37%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #550 +/- ## ========================================== - Coverage 95.80% 95.37% -0.43% ========================================== Files 33 33 Lines 1406 1406 ========================================== - Hits 1347 1341 -6 - Misses 59 65 +6 ```

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[eduardo-rodrigues]

The CI is "failing" because of new warnings from Pandas. That is totally unrelated and will be dealt with separately. Merging.

[eduardo-rodrigues]

Addressed task https://github.com/scikit-hep/particle/issues/497.