Update README

README.md

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 This is the preparation work for an official Racket track for exercism.io. When it's official it
 will be at https://github.com/exercism/xracket.
+
+# About exercism.io
+
+[exercism.io](http://exercism.io) lets people upload solutions to simple programming problems in a
+language that they are learning and get feedback/nitpicks from experienced language users about
+coding style and idiomacy.
+
+The problems come with automated tests. The learner writes a module, using the automated tests to
+check his implementation for completeness. He then uploads it to [exercism.io](http://exercism.io),
+where other people can comment on the learners code. The learner can upload improved revisions of
+his code in response to feedback. He can also look at other peoples solutions for inspiration and
+insight.
+
+Note that the automatic tests are never run against the learner's solution automatically.
+
+# Status and a request for review
+
+I'm currently implementing tests for the various exercises (https://github.com/exercism/x-common).
+Since I'm a Racket learner myself, I need experienced Racketeers to review the interfaces the
+automated tests assume. Please look at the pull requests in this repo and give a thumbs up or a
+suggestion what can be improved.
+
+Every problem also includes an example solution. However, the solution is only there to check that
+the automated tests work correctly. The learner doesn't see the solution.
+
+So while you're welcome to comment on the example solution as well, keep in mind that it'll
+immediately benefit only me. The primary focus of the review is the data structures that the tests
+require as the interface.
+
+In the end we will also have to decide on the order in which the problems are