fix: update Firestore rules

[tomarra]

Description

Adding in a few more checks

• Initials have to be 3 in length and only be capital letters
• Score needs to be within the valid score window
• Character needs to match the defined set

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

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[eseidelGoogle]

I believe @erickzanardo already has commit access and should be able to help this land. @tvolkert or @Hixie can also get you (and your VGV colleagues) access via https://github.com/flutter/flutter/blob/master/CONTRIBUTING.md.

Thanks for your continued work on this, looks great. :)

[creativecreatorormaybenot]

I like this PR but I think this is not the best conduct. We should have merged #467 and created a new PR for the score change.

We can merge this one anyway for now because I really do not mind, but it is not how I would do OSS.

[tomarra]

I like this PR but I think this is not the best conduct. We should have merged #467 and created a new PR for the score change.

We can merge this one anyway for now because I really do not mind, but it is not how I would do OSS.

Sorry about that! Was not the intent. I was working on these in parallel it seems.

[RuiMiguel]

just leave a small comment on the regex, but ok 👍

[tvolkert]

rslgtm