Update README.md

Added bashrc function to use PanGeTool more easely

README.md

 # PanGeTools
 
-Apptainer container containing useful tools for pangenomics analysis. Versions of tools is reported in the definition file, in the help section.
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+Apptainer container containing useful tools for pangenomics analysis. Versions of tools is reported in the definition file, in the help section.
+
+Add the following function to your bashrc to have easier commands : 
+```
+# Folder containing apptainer images (.sif)
+apptainerpath="<path_to_apptainer_folder>"
+
+# Function to easly run PanGeTools.
+# The command is PanGeTools <tool name> <tool args>
+PanGeTools() {
+    apptainer run --app $1 $apptainerpath/PanGeTools.sif "${@:2}"
+}
+```
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