As well you could use Fritzing to make yourself a schematic to post and have reviewed, just modify the one for the battery charger to add the two resistors to pin 7 and add in whatever processor you are going to use connecting its analog input pin to pin7 on the charger IC (along with the resistors). The current leds (if you choose to use them) each need an output pini, other wise you need to connect whatever leds you are going to use to output pins with an appropriate current limiting resistor. If your are planning on using an Arduino the examples in the Arduino IDE (such as blink which blinks a led, which is one of the things you need to do) would be an appropriate starting place to make your changes. I expect there are examples of analog input code there as well.
Peter Van Epp