add note kind scripts

source/funkin/play/notes/notekind/ScriptedNoteKindScript.hx

@@ -0,0 +1,9 @@
+package funkin.play.notes.notekind;
+
+/**
+ * A script that can be tied to a NoteKindScript.
+ * Create a scripted class that extends NoteKindScript,
+ * then call `super('noteKind')` in the constructor to use this.
+ */
+@:hscriptClass
+class ScriptedNoteKindScript extends NoteKindScript implements polymod.hscript.HScriptedClass {}