feat: add the ability to turn on/off sound

[Halloween5]

👉 Checklist

Please make sure to check off the following before submitting:

• [ ] I have reviewed my submission thoroughly.
• [ ] I have tested my code (if submission is related to coding) and run the game before pushing (to make sure the project compile).
• [ ] I have run the JUnit tests (if submission is related to coding).
• [ ] I have read the Code of Conduct and Contribution Guidelines.

✍ Description of the Pull Request

Please concisely describe the changes you have made.

What?

• I add the ability to turn off sound.

Why?

• I noticed the project's issue on sound issues.

How?

• I set a variable to record a soundbutton click event and control the background music. I store this variable locally.

🔗 Issue link

Issue reference number and link goes here e.g. 'Fixes/Closes #<issue_number>'.

• [ ] This Pull Request fixes the issue : 'Closes #'
• [ ] This Pull Request does not fix an issue.

Thanks for taking the time to fill out this Pull Request! ❤️ Thanks for contributing to this project 🦖

[jvondermarck]

Please next time, can you fill out the PR template by checking/unchecking the different boxes ?

[Halloween5]

ok, thank you

[jvondermarck]

@Halloween5 if you need any help doing that, do not hesitate to ask for help, I'm here ! ☺️

[jvondermarck]

Won't fix, too old. Please submit another new PR if needed. Sorry.