Add prettier to project

[blocus]

PR Details

Description

I found that this project doesn't follow any code style so I added my prettier config file and I added a script to format the project. Then I formatted the project so the new contributors could start with the same code style.

Related Issue

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Motivation and Context

• Why is this change required?
• What problem does it solve?

How Has This Been Tested

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• Include details of your testing environment, and the tests you ran to.
• see how your change affects other areas of the code, etc.

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• [x] Docs change / refactoring / dependency upgrade
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• Go over all the following points, and put an x in all the boxes that apply.
• If you're unsure about any of these, don't hesitate to ask. We're here to help!

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.