feat: add feature return library components and Jest configuration

.vscode/extensions.json

@@ -4,6 +4,7 @@
     "esbenp.prettier-vscode",
     "angular.ng-template",
     "nrwl.angular-console",
-    "dbaeumer.vscode-eslint"
+    "dbaeumer.vscode-eslint",
+    "firsttris.vscode-jest-runner"
   ]
 }