Making USB power supply out of 5V 60A LED DC power adapter
There is nothing more than just soldering 5V(+) to 5V(+) and GND(-) to GND(-) .

USB uses also 5V so there is no need for any aditional circuitry.

The only thing you may want to do (which isnt necessary) is to use pullup or pulldown resistors on the data lines because many smartphones uses this to detect how much current they can draw from the power adapter.

Using pullup or pulldown resistors means that you connect a resistor from 5V(+) or GND(-) to one of the data pins (Usually they are white and green when you use an old USB Cable). But you would need to search online for the resistor value.
But that is not necessary, just optional