USB charge controller avaliable for hobbyists?
If you short D+ with D- inside your charger port/cable, devices will take up to 1.5 A, not 500 mA.

If you want to build a QC charger, it is quite more complicated. To start, take a look at Texas Instruments reference guide 



If you want to embark on Power Delivery, it is even more challenging. To start, look into educational materials like this from STI. An example for a powerbank:



Have fun and a good luck.