Quick n dirty

after cloning, run py -3 -m venv .venv in the root directory
and then .venv\Scripts\activate to activate the virtual environment
on windows you might need to do Set-ExecutionPolicy Unrestricted -Force first and then activate the virtual environment
then pip install Flask inside the virtual env
create instance folder, and create config.py file inside. paste in the default config from the readme
you might also need to init a database, so use flask --app myriad init-db
to start the site use flask --app myriad run --debug

do not deploy this way, the packaged flask server is not secure. production instructions will be provided when the project is ready

you will need to run .venv\Scripts\activate from the folder every time you start working on it
re-building the entire database with flask --app myriad init-db (losing all the data inside) will be necessary as development continues. DO NOT STORE ANYTHING IMPORTANT DURING DEVELOPMENT
start the site with flask --app myriad run --debug as usual