add conda env export and create

docs/Readme-Python.txt

@@ -4,9 +4,7 @@ J Grelet June 2011 - March 2019 - Avril 2021
 
 Conda:
 -------
-Installer mini conda
-
-
+Installer miniconda
 
 > conda config --add channels conda-forge
 
@@ -18,6 +16,20 @@ It is possible to list all of the versions of matplotlib available on your platf
 
 > conda search matplotlib --channel conda-forge
 
+Installation based on an YAML environment file
+
+> conda env create -f environment<OS>.yml -n <new_env_name>
+
+example:
+
+> conda env create -f environment-windows.yml -n ms1
+
+Export your environment
+
+Duplicate your environment on other computer or OS, just export it to a YAML file:
+
+>conda env export --no-builds > environment-windows.yml
+
 
 Les listes:
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