Update README.md

[olivierlesnicki]

python-tk is needed

Summary by Sourcery

Update README.md to include 'python-tk' as a required dependency for the basic setup.

Documentation:

• Add 'python-tk' to the list of required dependencies in the README.md file.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request updates the README.md file to include python-tk as a required dependency for the basic setup of the project. The change is straightforward, adding a single line to the list of setup requirements.

File-Level Changes

Files	Changes
README.md	Added python-tk to the list of basic setup requirements

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