Add updateTestUnit prompt and PR template

[MirakuSan]

Add updateTestUnit prompt and PR template

✅ Type of PR

• Refactor
• Feature
• Bug Fix
• Optimization
• Documentation Update

🗒️ Description

Added a new prompt :updateTestUnit for updating existing unit test files when source code changes, and created a structured PR template for the repository. The new prompt provides comprehensive guidance for maintaining test coverage while adapting to code modifications.

🚶‍➡️ Behavior

• Users can now use :updateTestUnit to systematically update test files after code changes
• The prompt guides through analyzing changes, updating existing tests, and adding new test cases
• Added PR template ensures consistent and structured pull request creation
• Updated README documentation includes the new prompt with detailed description

🧪 Steps to test

• Verify the new prompt appears in README.md table of contents
• Check that the :updateTestUnit prompt section is properly formatted
• Confirm PR template is accessible at .github/pull_request_template.md
• Test that the template structure follows the documented format
• Validate that all prompt instructions are clear and actionable

[trag-bot]

Pull request summary

• Added a pull request template to standardize contributions and improve clarity in submissions.
• Updated the README file to include a new section for updating unit test files after code modifications, ensuring better documentation of testing practices.
• Corrected various typographical errors throughout the README for improved readability and professionalism.
• Enhanced the clarity of instructions in the README by rephrasing sentences to eliminate ambiguity.
• Introduced a new prompt for updating unit tests, detailing the steps to maintain test coverage and adapt to code changes.
• Ensured consistent formatting in the README, including the use of quotation marks and markdown syntax for better presentation.
• Added specific guidelines for validating test updates with users to ensure alignment with business scenarios.
• Improved the structure of the README by organizing content into clearer sections and bullet points for easier navigation.

[trag-bot]

Pull request summary

• Added a pull request template to standardize contributions and improve clarity in submissions.
• Updated the README file to include a new section for updating unit test files after code modifications, ensuring better documentation of testing practices.
• Corrected various typographical errors throughout the README for improved readability and professionalism.
• Enhanced the clarity of instructions in the README by rephrasing sentences to eliminate ambiguity.
• Introduced a new prompt for updating unit tests, detailing the steps to maintain test coverage and adapt to code changes.
• Ensured consistent formatting in the README, including the use of quotation marks and markdown syntax for better presentation.
• Improved the structure of the README by organizing content into clearer sections, making it easier for users to navigate.
• Added specific guidelines for maintaining existing test structures and conventions in the new unit test update prompt.