fix(14): generate a tsconfig file in e2e with ng add (#15)

Fixes #14

Author: cexbrayat

src/schematics/ng-add/files/e2e/tsconfig.json

@@ -0,0 +1,4 @@
+{
+  "extends": "../tsconfig.json",
+  "include": ["./**/*.ts"]
+}

src/schematics/ng-add/index.spec.ts

@@ -59,6 +59,7 @@ describe('ng-add', () => {
     const tree = await runner.runSchematic('ng-add', {}, appTree);
 
     expect(tree.files).toContain('/playwright.config.ts');
+    expect(tree.files).toContain('/e2e/tsconfig.json');
     expect(tree.files).toContain('/e2e/example.spec.ts');
 
     const packageJSON = JSON.parse(tree.readContent('/package.json'));