Added README

Author: glatard

boutiques/README.md

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+# Boutiques descriptors
+
+This directory contains a
+[Boutiques](https://github.com/boutiques/boutiques) descriptor for the
+BIDS app and an example of invocation.
+
+## How to use
+
+* Install Boutiques: `pip install boutiques`
+* Run the example: `bosh ./bids-app-example.json -i ./invocation.json`
+  (assumes `ds001` is a valid dataset in the current working
+  directory.)