Add an option to install with conda on conda-forge channel

[sugatoray]

Adding whatlies to conda-forge channel would allow people to install the library with conda (without having to use pip install whatlies inside a conda environment).

I have started the work already. Will push a PR (to update the installation documentation in README.md), once the conda-forge package is ready.

conda-forge whatlies PR

[sugatoray]

cc: @koaning

[sara-tagger]

Thanks for the issue, @desmarchris will get back to you about it soon!

You may find help in the docs and the forum, too 🤗