Improve README for better orientation

README.md

@@ -1 +1,17 @@
-See Releases: https://github.com/zksnacks/wabisabi/releases
+# WabiSabi
+
+WabiSabi is an anonymous credential scheme for centrally coordinated CoinJoin
+transactions.
+
+You can download [the latest version of the
+PDF](https://github.com/zkSNACKs/WabiSabi/releases/latest/download/WabiSabi.pdf),
+as well as find older versions in the [releases
+section](https://github.com/zksnacks/wabisabi/releases).
+
+A [simplified explainer](./explainer.md) with an informal description by
+analogy using real world concepts is also provoided.
+
+For more information on how the credential scheme can be applied, we also
+describe a [generic protocol](./protocol.md) (work in progress).
+
+Details of the specific transaction structure are still TBD.