This is a paid asset, but now you can download Basic Platformer Template for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Basic Platformer Template v1.1
2D Platformer Game Template.
This project contains everything necessary to make a platform game. You can add new functions easily or go directly to the level design. The code is simple, scalable and commented. It is well documented and the sample scene contains all the elements.
+ Ready for PC and Mobile.
+ Advanced Character Controller.
+ AI Monster.
+ Combat System.
+ 2D Camera.
Note: These samples require the 2D Pixel Perfect package. Install the latest version via Unity’s Package Manager.