JSLegend

Results 3 issues of JSLegend

Improved CONTRIBUTING.md to make Kaboom dev clearer.

![image](https://github.com/marklovers/kaplay/assets/128189209/132977be-cf21-471d-9162-a496d606a7a4) When displaying a sprite, all pixels do not have the same width and height. As discussed with @mflerackers on discord this is due to padding added by Kaplay. Expected...

bug

Someone mentioned under my KAPLAY in 5 mins video that the performance of the shooter example would degrade after 20s if they increased the trash spawn rate to 0.1. After...