added content for mobile applications (#2674)

content/roadmaps/100-frontend/content/121-mobile-applications/readme.md

@@ -1 +1,8 @@
-# Mobile applications
+# Mobile applications
+
+A while back, developing a mobile app using JavaScript was impossible. But now JavaScript developers can create mobile applications using their knowledge for web development. Here is the list of options to create mobile applications in JavaScript.
+
+* [React Native](https://reactnative.dev/)
+* [Flutter](https://flutter.dev)
+* [Ionic](https://ionicframework.com)
+* [NativeScript](https://nativescript.org/)