Jazzband Contributing Guide

[dpgraham4401]

Description

• Add a CONTRIBUTING.md guidelines to and use Jazzband's header,
• Remove non-tested django versions from the list of tested versions in the readme
• Add snippet on generating SECRET_KEYs with django
• Use filter to avoid running lint and test workflow when only markdown files have changed.

Relevant issues

#17

[Copilot]

Pull request overview

This PR implements several Jazzband guidelines for the django-fernet-encrypted-fields project (issue #17), including adding a contributing guide, updating the README with accurate test coverage info, and optimizing the CI workflow.

Changes:

• Added CONTRIBUTING.md with Jazzband header, code of conduct reference, and step-by-step contribution instructions.
• Updated README.md to correct the compatibility table (removing check marks for non-tested Django versions), add a SECRET_KEY generation snippet, fix a typo, and link to CONTRIBUTING.md.
• Added path filters to the CI workflow to skip lint/test runs for markdown-only changes, and expanded .gitignore.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 3 comments.

File	Description
CONTRIBUTING.md	New file with Jazzband header and contribution guidelines
README.md	Added SECRET_KEY generation snippet, fixed typo, updated compatibility table, added contributing link
.gitignore	Expanded with common Python and Node ignore patterns
.github/workflows/lint-and-test.yml	Added paths filter to pull_request trigger (but push is unfiltered)

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