Garage rafter storage system - easy to add and remove ?

Hi, I want to be able to quickly add a platform or easy to install frame or rafter system into my garage space to then allow me to place storage items. So, imagine a smaller garage with an open cross beams. I want to place some sort of spanner board or planks, something easy to install, so I can create a storage space in these currently empty rafter area in the garage.  Please add online links where I can purchase, a kit if possible, I can install without a contractor. Picture attached as an example of where I want to place storage. 

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