[DOC] Improve README

[dansysanalyst]

⚡ PowerGrid - Pull Request

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Motivation

• [ ] Bug fix
• [X] Enhancement
• [ ] New feature
• [ ] Breaking change

Description

This Pull Request improves the README content.

Related Issue(s):

Documentation

This PR requires Documentation update?

• [ ] Yes
• [X] No
• [ ] I have already submitted a Documentation pull request.