Add link to purchase/evaluate Adobe InDesign

README.md

@@ -1,7 +1,7 @@
 # Dungeon World
 Dungeon World is a tabletop roleplaying game. This text tells you how to play that game.
 
-You'll find the entire text of the game, broken up by chapter, here. The text is formatted in XML designed to be consumed by InDesign. Forgive any odd formatting or bad style, that's usually a concession to InDesign.
+You'll find the entire text of the game, broken up by chapter, here. The text is formatted in XML designed to be consumed by [InDesign](http://www.adobe.com/products/indesign.html). Forgive any odd formatting or bad style, that's usually a concession to InDesign.
 
 The InDesign files are also available here. They're not guaranteed to work since the InDesign file format uses fully qualified paths. The layout files make use of proprietary fonts, so some fonts may not load. The art used in the printed version of the game is not included.
 
@@ -13,4 +13,4 @@ What we hope you do with it is make new stuff: make classes, adventures, moves,
 ## Contributing
 In case you're a roleplaying game geek who also wants to contribute directly, we're open to pull requests. Typo fixes and editing would be wonderful.
 
-If you start a pull request please also modify text/appendices/Thanks.xml and add your name to the Contributors section so we can thank you.
+If you start a pull request please also modify text/appendices/Thanks.xml and add your name to the Contributors section so we can thank you.