Update readme with note about assets

Add built JS

Linting

Add built files

Merge pull request #30 from MattSurabian/replay

Replay feature with score commentary

Merge pull request #26 from MattSurabian/hard-source

Add hard-source

Merge pull request #14 from MattSurabian/pixi

PixiJS Refactor

Use val function in level creator logic

Update README