Finalized field configuration for now, fixed a bug in resolvers, added readme stub for data package

source/data/field-configuration-factories.mjs

@@ -17,4 +17,12 @@ export function typed_value(coercion_function, default_value, description) {
 
 export function typed_factory(coercion_function, factory_function, description) {
 	return new Field_Configuration(null, coercion_function, factory_function, description);
-}
+}
+
+export function required(description) {
+	return new Field_Configuration((value) => value !== undefined, null, null, description);
+}
+
+export function typed_required(coercion_function, description) {
+	return new Field_Configuration((value) => value !== undefined, coercion_function, null, description);
+}