Make the project more friendly to being a library

[gran4]

What is wrong and why is it wrong The project can not really be used as a library currently. It is structured solely for the bot. However, it should be easy to change it so it can be used for any stock related thing. Like getting the relevant years, etc.

Where is it wrong? Just everywhere

Check List

• [ ] Update type hints and docstrings
• [ ] Return values
• [ ] Option to not download the heavy Stocks Folder
• [ ] Add a read the docs
• [ ] Update Readme
• [ ] Add tests
• [ ] Finish Alpha version project
• [ ] Add a way to pip install
• [x] Update requirements.txt