ajout des instructions pour générer un package installable

README.md

@@ -20,6 +20,11 @@ Then, you can install the necessary packages of the library:
 `npm run buildspec`
 
 
+### To generate locally installable package
+
+`rm -rf jalhyd-<ver>.tgz build; npm build && npm pack`
+
+
 ### To compile and test code with jasmine
 
 `npm jasmine`