Feed the readme.

README.md

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-# tutopython
-Small tutorial for IPython / Scipy
+# IPython / Scipy tutorial
+
+## Installation
+
+### Conda / Anaconda
+
+First we need nuts & bolts.
+
+- Conda [[doc]](http://conda.pydata.org/docs) is a package manager application (``pip`` + ``venv`` + ``virtualenvwrapper``)
+- Anaconda [[link]](https://www.continuum.io/downloads) is a Python distribution which include more than 300 of the most popular Python packages for science,
+math, engineering, and data analysis.
+
+Then we set up an environment for the tutorial:
+
+	$ conda create -n tutopython python=3.4
+	$ source activate tutopython
+
+
+### Python packages
+
+It's now time to install some packages :
+
+	$ conda install ipython numpy scipy matplotlib
+
+and you're ready to play with ipython's command line interface.
+
+	$ ipython
+	Python 3.4.3 |Continuum Analytics, Inc.| (default, Mar  6 2015, 12:07:41)
+	Type "copyright", "credits" or "license" for more information.
+
+	IPython 4.0.0 -- An enhanced Interactive Python.
+	?         -> Introduction and overview of IPython's features.
+	%quickref -> Quick reference.
+	help      -> Python's own help system.
+	object?   -> Details about 'object', use 'object??' for extra details.
+
+	In [1]:	
+
+But a more powerful environment is available to carry out exploratory computation and data analysis : notebooks.
+
+## IPython notebooks
+
+Notebooks are interactive computational environments, in which you can combine code execution, rich text, mathematics, plots and rich media. See <http://ipython.org/notebook.html>. 
+
+ ![illustration](images/notebook-sample.png)
+
+Notebooks are stored as JSON files with a ``.ipynb`` extension.
+
+ 	$ conda install ipython-notebook
+ 	$ ipython notebook
+	[I 09:30:28.237 NotebookApp] Using MathJax from CDN: https://cdn.mathjax.org/mathjax/latest/MathJax.js
+	[I 09:30:29.031 NotebookApp] Serving notebooks from local directory: /Users/honnorat/Documents/YeastLab/tutopython
+	[I 09:30:29.031 NotebookApp] 0 active kernels
+	[I 09:30:29.032 NotebookApp] The IPython Notebook is running at: http://localhost:8888/
+	[I 09:30:29.032 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
+	[W 09:30:38.422 NotebookApp] Notebook tuto_filter.ipynb is not trusted
+	[I 09:30:39.040 NotebookApp] Kernel started: ce530cd1-a559-4e8e-895c-c9543ea61f4f
+
+Now you can open your browser at the given address <http://localhost:8888/> and create a new notebook.