Add .deepsource.toml

Added type annotations to all of TaIGa's main functions, and enforced…

… static typing with mypy

Changed the values of the initialized properties of the Taxon object …

…to be None instead of 'N/A' where appliable

Improved the handling of taxa with missing classification information…

…, preventing TaIGa from quitting every time it finds a problem

changes related to development

Merge branch 'master' of https://github.com/flayner2/TaIGa

Merge branch 'master' of https://github.com/flayner2/TaIGa

Update README.md

Merge branch 'master' of https://github.com/flayner2/TaIGa

Update README.md