ci: 👷 pre-commit readme badge and config added

Signed-off-by: Onuralp SEZER <[email protected]>

README.md

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 [![📚 Generate PDF Develop](https://github.com/openSUSE/lessons/actions/workflows/pdf.yml/badge.svg)](https://github.com/openSUSE/lessons/actions/workflows/pdf.yml)
 [![📚 Publish - openSUSE Lessons Doc Website](https://github.com/openSUSE/lessons/actions/workflows/mkdocs-publish.yml/badge.svg)](https://github.com/openSUSE/lessons/actions/workflows/mkdocs-publish.yml)
+[![pre-commit.ci status](https://results.pre-commit.ci/badge/github/openSUSE/lessons/main.svg)](https://results.pre-commit.ci/latest/github/openSUSE/lessons/main)
 
 This project is a collaborative effort for designing and preparing lesson plans for teachers, home educators, students and self-learners. The lesson plans focus on segments of open-source software development, culture and contribution. The material is helpful for curriculums involving the teaching of IT courses in primary, secondary and higher education.