docs: add Code of Conduct, License, Security Policy, and templates

[KHolodilin]

Description

Add essential project documentation files including Code of Conduct, License file, Security Policy, and GitHub templates for issues and pull requests. This improves project professionalism, provides clear guidelines for contributors, and streamlines the contribution process.

Changes Made

• ✅ Added LICENSE file (MIT License)
• ✅ Added CODE_OF_CONDUCT.md (Contributor Covenant 2.1)
• ✅ Added SECURITY.md with vulnerability reporting process
• ✅ Added GitHub issue templates:
  • bug_report.md - Bug report template
  • feature_request.md - Feature request template
  • question.md - Question template
  • config.yml - Issue template configuration
• ✅ Added .github/pull_request_template.md - Pull Request template

Type of Change

• Documentation update

Testing

• All files properly formatted (Markdown)
• Pre-commit checks pass
• No linting errors

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my own code
• I have updated the documentation accordingly
• My changes generate no new warnings
• Pre-commit hooks pass (pre-commit run --all-files)
• Code formatting passes (ruff format --check .)
• Linting passes (ruff check .)

Related Issue

Fixes #19

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
email_processor/cli/commands/passwords.py	50.00%	2 Missing ⚠️

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