hollywoo README with type param guide

projects/hollywoo/README.md

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+# hollywoo
+Portable interface for kinetic novel dev/animated filmmaking
+
+## Principles
+
+TODO explain Director
+
+## Maintenance
+
+### How to add a type to Director:
+
+You must add the type parameter in many places:
+
+* Movie.hx (on class Movie)
+* Movie.kiss (on prop director)
+* Scene.hx (on typedef Scene) (if scenes will contain it)
+* Director.hx (on class Director AND field movie)
+* YourMovieType.hx, YourMovieType.kiss and YourDirectorType.hx, YourDirectorType.kiss in your Hollywoo director implementation