Expand README and add simple example pipeline

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 # bionix
-Nix functions for use in bioinformatics, and a sample DE analysis
+
+Bionix is a set of [Nix](http://nixos.org/nix) expressions for specifying and
+executing bioinformatics pipelines. It is currently a work in progress, so
+documentation is sparse.
+
+## Getting started
+
+Install [Nix](http://nixos.org/nix) and then try `nix-build` in the examples
+directory.
+
+## Example pipeline
+
+The examples directory shows a simple pipeline in the call.nix and default.nix
+files. You can build it with `nix-build` in the examples directory. The result
+will be linked to ./result, which in this example case is an empty VCF file.
+
+## Contact
+
+Please come chat with us at [#bionix:cua0.org](http://matrix.to/#/#bionix:cua0.org).