Add python development dependencies

[GreasySlug]

Currently, there are no specified packages or libraries for Python development

I added requirements.txt(or pyproject.toml) as the beginning of it for now, as it will be needed in the future

black is a de fact standard of python code formatting

Others include the following as well

• flake8
• typing
• mypy
• pytest

Do mtshiba think these need to be added for dev dep?

Changes proposed in this PR:

• Add requirements.txt
• formatting with black

@mtshiba

[GreasySlug]

For some reason CI did not finish with ubuntu and macos

[C-BJ]

ci can be rerun @GreasySlug

[GreasySlug]

change to this

All strings must be quoted by single quotes to prevent shell interpretation

I miss this sentence and used double quotes by misstake That's why, shell went wrong and REPL caused infinite loop(so CI did not finish)