Export rules class and rule interface (#598)

* Export rules class and rule interface

* Update api.ts

* Update api.test.ts

Author: tclindner

src/api.ts

@@ -9,3 +9,5 @@ export {LinterResult} from './linter/linter';
 export {PackageJsonFileLintingResult} from './types/package-json-linting-result';
 
 export {PackageJsonFileAggregatedResultCounts, OverallAggregatedResultCounts} from './linter/results-helper';
+
+export {Rules, Rule} from './native-rules';

test/unit/api.test.ts

@@ -34,4 +34,8 @@ describe('api Unit Tests', () => {
   test('OverallAggregatedResultCounts should be exported', () => {
     expect(api).not.toHaveProperty('OverallAggregatedResultCounts');
   });
+
+  test('Rules should be exported', () => {
+    expect(api).toHaveProperty('Rules');
+  });
 });