DOC: add readme

README.rst

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+.. image:: http://picknik.io/PickNik_Logo3.png
+   :target: http://picknik.io/
+   :alt: picknik logo
+
+
+Generate Mock Amazon order
+--------------------------
+
+Simple Python utility to create a simulated bin inventory and random
+json order, that you can get by running::
+
+    python random_orders.py order.json
+
+Note that you can repeat experiments setting the used seed, and modify
+the likelyhood of the number of objects per bin too::
+
+    usage: random_orders.py [-h] [--probabilites PROBABILITES] [--seed SEED]
+                            filename
+
+    positional arguments:
+      filename              filename to save the json order to
+
+    optional arguments:
+      -h, --help            show this help message and exit
+      --probabilites PROBABILITES, -p PROBABILITES
+                            Quote delimited list of probabilites. Eg "[0.5, 0.2,
+                            0.2, 0.1]". Determines the likelyhood of filling up
+                            with [1, 2...] elements the bins that aren't
+                            determined by the contest rules. Defaults to [0.7,
+                            0.2, 0.1], so that there are no bins with more than 3
+                            elements.
+      --seed SEED, -s SEED