update README

README.md

@@ -6,7 +6,7 @@ Only_obitools pipeline using NEXTFLOW
 1. [Introduction](#1-introduction)
 2. [Installation](#2-installation)
 	1. [Requirements](#21-requirements)
-	2. [Optional components](#22-optional-components)
+	2. [Downloading](#22-downloading)
 3. [Reporting bugs](#3-reporting-bugs)
 4. [Running the pipeline](#4-running-the-pipeline)
 
@@ -18,8 +18,6 @@ Here, we reproduce the bioinformatics pipeline used by [SPYGEN](http://www.spyge
 
 # 2. Installation
 
-You will need to install
-
 ## 2.1. Requirements
 
 In order to run "only_obitools", you need a couple of programs. Most of
@@ -29,10 +27,19 @@ programs and libraries you absolutely need are:
 - [OBItools](https://pythonhosted.org/OBITools/welcome.html#installing-the-obitools)
 
 
-## 2.2. Optional components
+## 2.2. Downloading
 
-Other libraries are optional and only limit the features that are
-built. These include:
+* open a shell
+* make a folder, name it yourself, I named it workdir
+```
+mkdir workdir
+cd workdir
+```
+* clone the project and switch to the main folder, it's your working directory
+```
+git clone http://gitlab.mbb.univ-montp2.fr/edna/nextflow_obitools.git
+cd nextflow_obitools
+```
 
 
 # 3. Reporting bugs