1. Start adding some text (a big font works best). Use the same color for your text as you used on your background. Ctrl + Click on the text layer. This will make the text visible.
2. Add a new layer and call it stroke. Go to Edit > Stroke and set the Width to 2 px and the Location to Outside. Click OK
3. Doubl Click on the stroke layer, and in the layer style choose stroke. Set the size to 1 px and choose the color you want.
4. To finish up, add some Drop Shadow. Use default settings. Voila, thats all!
Here is how it looks if you use another color on the main text
