[akifkulll]

Small docs cleanup. No code changes.

Summary

• README wording: "builds on top of it" suggested a dependency on scikit-learn, but there is none. The sentence now says the toolkit works alongside scikit-learn: blocks run inside scikit-learn pipelines, cross_val_score and GridSearchCV without depending on it.
• CI badge: a badge for ci.yml, directly under the README title.
• PR template: .github/PULL_REQUEST_TEMPLATE.md with these sections:
  • Closes #;
  • Summary;
  • How was it tested;
  • a checklist: ruff format/check, pytest, the block rules in CONTRIBUTING.md, and leakage + cross_val_score tests.

How was it tested

• ruff check . and ruff format --check . (ruff 0.17.1): clean. This includes the README, because ruff checks code in Markdown files.
• pytest: 32 passed, Python 3.13.5.

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