Adding hints to avoid erros with composer and yarn

on quick updates

README.md

@@ -93,6 +93,10 @@ yarn run encore dev
 ~~~~
 This will update the JS (yarn) and PHP (composer) dependencies in the public/build folder.
 
+Some times there are conflicts with existing files so to avoid those here are some hints/
+- for composer errors you can remove the vendor folder and composer.lock file
+- for yarn erros you can remove yarn.lock .yarn/cache/* node_modules/*
+
 ### Refresh configuration settings
 
 In case you believe some settings in Chamilo might not have been processed correctly based on an incomplete migration