Circuit Diagram

This provides a visual reference for wiring of the components. They aren't true to scale, just meant to be used as reference. This diagrams was created using Fritzing software.

Connections:

Gemma: 

The GND is shared with all ground (-) connections.

D2 connects two of the LEDs, each on the opposite side of the crown.
D0 connects the other two LEDs.
220Ω resistors connect on the positive legs of the LEDs 

Battery:

The 150mAh lipo battery connects to the JST connector on the Gemma M0

Wires:

Make wires for the LEDs furthest from the Gemma, 150mm long to reach to D2 and D0 pads on the Gemma board.

The shorter distant LED wires can be 30mm long.