[TurboModule] Add a NativeModule Spec file

Author: cortinico

js/NativeAnswerSolver.js

@@ -0,0 +1,15 @@
+/**
+ * @format
+ * @flow strict-local
+ */
+
+'use strict';
+
+import type {TurboModule} from 'react-native/Libraries/TurboModule/RCTExport';
+import {TurboModuleRegistry} from 'react-native';
+
+export interface Spec extends TurboModule {
+  answerTheUltimateQuestion(input: string): number;
+}
+
+export default (TurboModuleRegistry.get<Spec>('NativeAnswerSolver'): ?Spec);