There are few different ways to create a stroke. The easier way is to have install the Layerfx plugin:
1. Go to the Layer menu and select: Layer Effect> Stroke
![Image](http://gimpchat.com/files/6266_Layerfx%201.jpg)
2. On the dialog Stroke, select the Size, Position and the Color and click Stroke.
![Image](http://gimpchat.com/files/6266_Layerfx%202.jpg)
The other way if you don't have the Layerfx plugin is:
1. Go to the Layers dialog, right click the Text layer and select, Alpha to selection.
![Image](http://gimpchat.com/files/6266_Photo%201.jpg)
2. Go to menu: Select and choose, "To path" to create a path (Paths are smoother)
![Image](http://gimpchat.com/files/6266_Photo%202.jpg)
3. Get rid of the selection, go to: Select> None
![Image](http://gimpchat.com/files/6266_Photo%203.jpg)
4. Set the color you want on the Foreground/Background palette
![Image](http://gimpchat.com/files/6266_Photo%204a.jpg)
5. Go to: Edit> Stroke path and another dialog will open. Here, by default the top option is selected is "Stroke Line".
![Image](http://gimpchat.com/files/6266_Photo%204.jpg)