Adding method from template is not stable at this moment?

[tonyliang19]

Using the template to add method requires these steps:

1. Make pip env or host env to have jinja2, docopt, and pyyaml installed
2. Call the bin/adding_method/add_method.sh to run a python code that generates files from template
3. Need to have a apptainer image named as <method_name>.sif in the MESSI_apptainer_images/ dir
4. Then need to implement these scripts: preprocess, train, predict .R or .py depending on the language