Add CONTRIBUTING.MD

[bcebere]

It should be clear for new contributors how to set their dev environment and how to run static checks locally before raising a PR.

This should also be added as a page at the top of README.md, for easy access.

The list should include:

• creating a new conda/work env.
• installing and running the pre-commit tools.
• installing the dev depends using pip install synthcity[testing]
• running the tests locally

Example from Opacus: https://github.com/pytorch/opacus/blob/main/CONTRIBUTING.md

[pravsels]

I would find this very useful. I'm using a docker container locally and changes I make to the synthcity repository don't seem to be recompiling. I'm having to do a pip install . every time.

On Colab the pip install . flow is faster so that's how I'm doing it currently.

[bcebere]

Hello @pravsels

You can use pip install -e . and you won't need to reinstall the library on every change. This installs the library in the editable mode.