Add BuildingMOTIF installation instructions to the documentation

[wehuang16]

I don't see anywhere in the documentation buildingmotif.readthedocs.io/ that says how to install BuildingMOTIF (I believe that the method to install BuildingMOTIF is to use "pip install buildingmotif", and correct me if I am wrong.). Is it possible if the instructions to install BuildingMOTIF can be added to the documentation buildingmotif.readthedocs.io/, please?

[gtfierro]

Hi @wehuang16 . We are still in development mode, so we don't have recent releases on pip. I would follow the development instructions for installing buildingMOTIF here: https://nrel.github.io/BuildingMOTIF/reference/developer_documentation.html

After we have our next release, we can publish a new version on pip. @TShapinsky @MatthewSteen we should consider having more regular PyPi pre-releases so it's a little easier to use BuildingMOTIF in a virtual environment

[MatthewSteen]

See #218.