Updated the README files to markdown, improved the instructions.

README.md

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+# Refactoring Katas
+
+Can you refactor? In really small steps? Can you turn some, frankly, ugly code into a paradigm of elegant, readable, extensible design?
+
+This is a collection of starting files for when practicing refactoring.
+
+Contents so far:
+
+- Tennis Kata in Java, Python and C++.
+- Gilded Rose Kata in C++, C#, Java, Python, Smalltalk, C and Ruby. (a C# version together with a starting project is already available on github [here](https://github.com/NotMyself/GildedRose))
+- Yahtzee Kata in C#, Java, C++ and Python (the C#, C++ and Java versions are also available in Jon Jagger's Cyberdojo, see [his blog post](http://jonjagger.blogspot.co.uk/2012/05/yahtzee-cyber-dojo-refactoring-in-java.html))
+
+For more information about these and other katas, you may be interested in my book [The Coding Dojo Handbook](http://leanpub.com/codingdojohandbook)