Tasks: * Improve READE.md * Reference to MSB's original language spec and manual doc * Update to match the recent improvements * Document feature differences between MSB and ISB. * Language features: see ISB-specific features in [unittest](https://github.com/wixette/isb/blob/main/csharp/ISB.Tests/LanguageFeaturesTest.cs). * How to implement and register libraries * Unity specific features (like preserve and coroutine-support)
Tasks: