Feat: yaml config file

[sudo-Tiz]

I am currently on smartphone and i can't test the code (linked to #88 )

[sudo-Tiz]

Code have to be modified to set the default value if not defined neither in the config-file neither in cli args

[shizunge]

Thanks for the CL.

However we need more cleanup before checkin this: As now we have two ways to setup the config, and we may add env in the future, I would like to move the corresponding code to their own package.

In the mean time, you can help

• Updating the README. If you want, you can create a new file in a new docs folder.
• Adding examples how to use the config file.

We can have docs as specification, and examples as test input before implementing things.