Go to the Styles panel and in the dropdown menu, select Stroke.
You will then have some presets to surround the text.
Once the Stroke preset has been selected and applied, go to the Layers panel and double-click on the fx button at the right side of the layer. You can then make adjustments to the style preset, including changing the color and size of the stroke.
Alternatively, you can try a Bevel style instead of a stroke. Or even use both.