Add automatic installation

 # Prerequisites
 
-## Get sources
+## Automatic installation
+
+### Dependency
+In order to run the automatic installation, one need to install conda with python3.
+The installation of conda with python3 is described [here](https://docs.anaconda.com/anaconda/install/linux).
+
+### Run the installation
+Dowload the installation script from [here](https://entrepot.ibisc.univ-evry.fr/f/d4f79b0ef2f545d99ca5/?dl=1).
+The installation can be run by: 
+```bash
+chmod +x script_irsom.sh
+./script_irsom.sh ENV_NAME
+```
+where `ENV_NAME` is the conda environment name which will be created.
+
+## Manual installation
+### Get sources
 
 The IRSOM tools can be download as follow:
 ```bash
@@ -8,7 +24,7 @@ git clone https://forge.ibisc.univ-evry.fr/lplaton/IRSOM.git
 ```
 IRSOM has been devleoped on python3.
 
-## Python package
+### Python package
 
 1. [Matplotlib](https://matplotlib.org/)
 2. [Pandas](http://pandas.pydata.org/)
@@ -25,7 +41,7 @@ where ${path\_IRSOM} is the path to the directory of IRSOM.
 
 For better performance, we recommend to rebuild [TensorFlow](https://www.tensorflow.org/install) from [sources](https://www.tensorflow.org/install/install_sources).
 
-## Compilation Featurer
+### Compilation Featurer
 The repository contains a compiled Featurer compiled on linux in the bin folder.
 If needed, the binary can be compiles using the [Qt5](https://www1.qt.io/developers/) tools by doing:
 ``` bash