added: a new idea for making a todo app

I have added a new idea to make a intermediate level todo app with adequate features.

Projects/2-Intermediate/todo_app_idea.md

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+
+# Application Name
+
+**Tier:** 2-Intermediate
+
+Create a basic todo program where you can list all your tasks of the day and complete it! You can also share it with your friends to help them doing their work efficiently and not forgetting them. 
+
+## User Stories
+-  [ ] User can add add their tasks through an input field.
+-  [ ] The design should be easy to understand and use.
+-  [ ] Have a storage system to make the users not loose their tasks when they reload.
+
+
+## Bonus features
+
+-   [ ] You can add some sound effects on completing the tasks to cheer the user
+-   [ ] You can have a feature to show the user their progress.
+-   [ ] You can also have a feature to share your progress with anyone.
+
+## Useful links and resources
+
+[Make a simple todo app with javascript](https://www.w3schools.com/howto/howto_js_todolist.asp) 
+
+## Example projects
+
+[Minimal todo app](https://minimal-todo-app.vercel.app)