Detailed installation instructions in the README #39
Description
On Miraheze's support server, we see people seeking help using wikiteam3 because they are not familiar with how python works and can't understand the installation instructions.
The installation section can be expanded with a link to python's website asking them to install python and have it in their PATH (which should happen by default).
Sometimes, python is in the PATH but pip is not, which will confuse users who are not familiar with python. python -m pip install wikiteam3 --upgrade might be a better way to install wikiteam3.
I can submit a PR if these changes seem fine. Alternatively, a portal executable could be created with pyinstaller, but pyinstaller applications are prone to breakage and require additional attention.