This is a barebones version of the bunnyhopping movement used in my game, Velocity.
You will need Unity3d Version 2017.1.0f3 or higher. Clone or download this repository, then open the downloaded directory as a project. The scene "example" located at Assets/Scenes/example.unity contains the working player character. The code relevant to bunnyhopping is located at Assets/Scripts/StrafeMovement.cs
If you want to implement bunnyhopping yourself, I highly recommend Bunnyhopping from the Programmer's Perspective and More than you ever wanted to know about Air Strafing.