add a `conda` install option for `primp` on conda-forge channel

[sugatoray]

A conda installation option could be helpful. I have already started working on this, to add primp to conda-forge channel.

Conda-forge PR:

• Adding primp from PyPI conda-forge/staged-recipes#28780

Once the conda-forge PR is merged, you will be able to install the library with conda as follows:

conda install -c conda-forge primp

💡 I will push a PR to update the docs once the package is available on conda-forge.

[deedy5]

🆗 I don't mind