readme update

README.md

 # webapp_marine_worldmap_BOLD
 
-web-app interface investigating database Barcode of Life [BOLD](http://www.boldsystems.org/) geo referenced mitochondrial DNA barcode.
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+web-app interface investigating database Barcode of Life [BOLD](http://www.boldsystems.org/) geo referenced mitochondrial DNA barcode.
+
+
+# Installation
+
+## Prerequisites
+
+### CONDA
+
+* miniconda
+
+Instructions to install conda are [here](https://docs.conda.io/projects/conda/en/latest/user-guide/install/linux.html)
+
+* R shiny with conda
+
+```
+conda env create -f environment.yml
+conda activate rshiny
+```
+
+to desactivate:
+```
+conda deactivate rshiny
+```
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