chore: adds lockfile to source control

[MrLeebo]

Hello, you have an interesting project going on here!

I cloned the code to tinker with, but the repo currently ignores the lockfile. This can make it difficult for new contributors because they will have different dependencies than the app has been tested against.

Additional information: https://docs.npmjs.com/cli/v6/configuring-npm/package-locks#using-locked-packages

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Name	Status	Preview	Comments	Updated (UTC)
battlesim	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 11, 2023 5:27pm

[Trekiros]

Ah, good point. Forgot about that. Merging.