Add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Thanks for your interest in contributing to the parser!
+
+I no longer work on flow cytometry, so I will not personally develop any
+new features; howevever, PRs are welcome. 
+
+Be aware that I may comandeer the PRs and refactor them a bit.
+
+## Setting up for development
+
+The package uses [poetry](https://python-poetry.org/) together with
+[poethepoet](https://github.com/nat-n/poethepoet).
+
+### Install dependencies
+
+```shell
+
+poetry install --with dev,test
+```
+
+### List tasks
+
+```shell
+poe
+```
+
+### autoformat
+
+```shell
+poe autoformat
+```
+
+### unit tests 
+
+```shell
+poe pytest
+```
+