Add initial project configuration and documentation

- Introduced .editorconfig for consistent coding styles across the project.
- Added .eslintrc.cjs for linting rules and configurations.
- Created .gitignore to exclude unnecessary files from version control.
- Included .prettierrc for code formatting preferences.
- Established CHANGELOG.md to document notable changes and updates.
- Enhanced accessibility in index.html with ARIA roles and labels.
- Implemented sound effects toggle and undo functionality in the game.
- Updated README.md to reflect new features and improvements.
- Added CI workflow for automated testing and linting on pull requests.

Author: TMHSDigital

.editorconfig

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+# EditorConfig helps maintain consistent coding styles
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+

.eslintrc.cjs

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+module.exports = {
+    env: { browser: true, es2021: true, jest: true },
+    extends: ["eslint:recommended", "plugin:prettier/recommended"],
+    parserOptions: { ecmaVersion: "latest", sourceType: "module" },
+    rules: {
+        "no-unused-vars": ["warn", { argsIgnorePattern: "^_" }],
+        "no-console": "off"
+    }
+};
+

.github/CODEOWNERS

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+* @TMHSDigital
+

.github/CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+We are committed to a welcoming, inclusive, and respectful community.
+
+- Be kind and constructive. Assume good intent.
+- No harassment, hate speech, or discrimination.
+- Keep feedback actionable and specific.
+
+Report unacceptable behavior via a maintainer contact on GitHub. The maintainers may remove content or restrict participation to uphold this policy.

.github/CONTRIBUTING.md

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+# Contributing
+
+Thanks for your interest in contributing! This project is a static site (no build). Please:
+
+1. Fork the repo and create a feature branch
+2. Keep changes focused and small
+3. Run lint and tests locally (`npm run lint && npm test`)
+4. Open a PR with a clear description and screenshots if UI changes
+
+Guidelines:
+- Keep vanilla JS, HTML, CSS (no runtime frameworks)
+- Maintain accessibility (labels, keyboard, focus)
+- Preserve GitHub Pages deployment from repository root
+- Add tests for game logic changes

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+labels: bug
+---
+
+### Describe the bug
+
+### Steps to reproduce
+1.
+2.
+3.
+
+### Expected behavior
+
+### Screenshots or console logs
+
+### Environment
+- Browser and version:
+- OS:
+
+

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+labels: enhancement
+---
+
+### Problem to solve
+
+### Proposed solution
+
+### Alternatives considered
+
+### Additional context
+
+

.github/SECURITY.md

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+# Security Policy
+
+If you discover a security vulnerability, please responsibly disclose it by opening a security advisory or emailing the maintainer via GitHub profile contact. Do not open a public issue for sensitive reports.
+
+We aim to respond within 7 days.
+

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "daily"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+

.github/pull_request_template.md

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+## Summary
+
+Describe the change and its purpose.
+
+## Checklist
+
+- [ ] Tests added/updated
+- [ ] Lint passes locally (`npm run lint`)
+- [ ] No runtime changes to static hosting flow
+- [ ] Accessibility checked (labels, focus, keyboard)
+
+## Screenshots/Notes
+
+